Up For Discussion – Nonnative Species

Virginia Opossum (Didelphis virginiana) is non-native in British Columbia, Washington, Oregon, and California. Photo Credit L Reed
Up For Discussion
The upcoming issue of JWR will feature a Letter to the Editor questioning the ethics of treating and releasing non-native, invasive species. In this particular case, the species in question is Virginia opossums in California (introduced in 1910, according to Jameson & Peeters (California Mammals, University of California Press, 1988)). But rehabilitators across the U.S. are familiar with the dilemma of caring for European starlings and English (house) sparrows. And this concern is not limited to North America. In Australia the problem may be European rabbits, red foxes, and cane toads. Africa’s invasive species include the crab-eating macaque, grey squirrels, and Canada geese; the grey squirrel has also been introduced to central Europe, along with California quail and the bullfrog. Add to the list beaver in South America, raccoons and nutria in Asia.
Some rehabilitators believe that when an invasive species arrives for treatment the most humane and ethical protocol for all parties is to euthanize the animal. They may point out that rehabilitators have enough trouble garnering respect from the more established wildlife professions without engaging in activities that undermine efforts to support native wildlife populations. Others argue even an exotic species offers an opportunity to educate the public—about empathy AND environmental issues. Then there is the very practical concern over possible bad PR for a rehabilitation organization that depends on donations to operate getting “caught” euthanizing some of its patients simply because they are not deemed “worthy” of care.
Obviously, this is an enormous issue that needs to be faced and discussed by the wildlife rehabilitation community.
What are your thoughts on this matter?
What is the most important issue for rehabilitators to address—the health of the individual, the health of the population, or the health of the ecosystem?
Do you (if home-based) or your organization (if affiliated with a rehab center) have an established protocol for dealing with non-native wildlife species?
If so, what is it, and how did you come to this decision?
If not, why not?
Submit your responses to Kieran Lindsay, JWR Editor at jwr.editor@theiwrc.org
Attending the 11th International Effects of Oil on Wildlife Conference
By Susan Wylie, IWRC Board Member
Last month I attended the 11th International Effects of Oil on Wildlife conference in New Orleans, Louisiana. This conference was attended by a variety of professionals including government agencies, wildlife rehabilitators, veterinarians, biologists, researchers and oil response companies.
With oil spills occurring more frequently around the globe, I attended this symposium to acquire a better understanding of what is required to respond to oil spills and to determine what I could do to help with a response effort . Sadly, oil spills happen every day and it is likely that as a rehabilitator, I will participate in this type of response at some point.
The conference not only addressed topics such as the steps and protocols needed to respond to oil spills, but many presenters spoke of the current research that is being done to see the physical effects oil is having on wildlife and the surrounding environment. Presentations were also given on how to organize and manage volunteers during a crisis, and the planning and decision making needed to deploying an emergency response centre.
It caught my attention that responders are focusing their efforts more and more on animal welfare and the psychological effects response efforts have on animals. Responders are learning that these factors play a large role in the survival rate of oiled wildlife. Speakers emphasized the importance housing, enrichment and diet play in reducing the animal’s stress and increasing its chance of surviving in the wild. Examples and descriptions were given so that the participants could apply the knowledge to their own centres in emergency and non-emergency situations.
Networking and attending these types of events is crucial to preparing for the unprepared.The conference allowed both experienced and inexperienced individuals to share ideas and to discuss methods of response to small and large-scale oil spills and other emergency situations. Oil spill responders from the United Kingdom, New Zealand, United States, Canada and as far as Singapore networked together with the ultimate goal of saving wildlife in distress as quickly and efficiently as possible.
Mega-Agriculture and Wildlife Health
At the 2011 IWRC Symposium the Keynote Speaker was Dr Greg Harrison. He gave a fabulous talk about mega-agriculture and its far reaching effects, yes, even into wildlife rehabilitation. We are pleased to provide a full copy of his speech here! I highly recommend listening to the full hour below, but you can also access a short 5 minute introduction at the Harrison’s Pet Food YouTube Page.
Enjoy!
Kai
Home by the Holidays
Update January 10 2012: The puffin has been released in the Grand Banks region near other puffins.
A rehab center just outside of Montreal has been in the news recently, due to an unusual visitor, an immature Atlantic puffin a long way from home.

Sue Wylie, IWRC board member, instructor, and executive director of Le Nichoir, and her volunteers set up a habitat for the juvenille puffin in a bath tub.

The set up included a mesh pull out. A good place for the bird to get out of the water while protecting his feet. Photo: Lindsay D'Aoust

The puffin was fed a diet of smelt, a fish species that wouldn't cause problems with the bird's waterproofing. Photo: Lindsay D'Aoust

After a week of phone calls, Sue had set up a flight to Newfoundland for the puffin via AirCanada. Photo: Lindsay D'Aoust

Early December 22nd the bird was on a commercial flight, with a Newfoundland rehabilitator waiting on the other side. Photo: Lindsay D'Aoust
Kakapo Ambassador
Many rehabilitators deal with species that are not endangered, or at least still have a number of living members. But regardless of whether we rehab red squirrels or hyacinth macaws, we feel the specter of population loss. While not truly a rehab case, the below article is an interesting account of one member of one species with only 129 members. It highlights the important role we rehabilitators play in the protection and healing of threatened and endangered species. – Kai
By Barbara Heidenreich
Austin, Nov 30, 2011 – Sirocco is one of 129 Kakapo left in the world. This large, flightless, nocturnal species of parrot is famous for unusual behavior. During breeding season the males plant themselves in small depressions in the ground called “bowls”. They puff up with air and emit a resonant boom for up to eight hours a night. The boom attracts a female who is eagerly pounced upon by the hormonally charged male Kakapo. Sirocco, having been hand raised due to an illness, prefers to mate with human heads instead of female Kakapo.
Sirocco became famous when he directed his affections to the cranium of zoologist Mark Carwardine in the BBC series Last Chance to See. The viral video clip has been viewed more than 3.5 million times on YouTube http://youtu.be/9T1vfsHYiKY . Professional animal trainer Barbara Heidenreich was one of those viewers and reached out to the Kakapo Recovery Program to see if she could help.
Barbara commented on the situation. “I was amused by the clip like everyone else. However I came to learn that his sexual behavior had become a bit of a problem. Sirocco was at times quite relentless in his attempts to climb to people’s heads. There was concern he might get hurt by someone who was not charmed by his advances.”
Barbara traveled 7400 miles from the United States to New Zealand to work with Sirocco’s caregivers to develop a training plan based in positive reinforcement. The main goal was to teach Sirocco to redirect his sexual behavior towards something else. “We experimented with a stuffed owl. But will likely end up using one of his known favorite objects, a Crocs™ shoe.” says Barbara.
Sirocco has responded extremely well to training. He has already learned to present a number of behaviors that make it easier to care for him, including touching his beak to the end of a plastic chopstick. The chopstick allows caregivers to direct him where to go without handling. He is learning other behaviors as well. Many are based on Kakapo natural behavior. As ambassador for the Kakapo Recovery Program, Sirocco makes appearances to help educate people about his kind. By sharing his natural talents the team hopes to raise funding and awareness for this extremely endangered New Zealand parrot. Learn more at www.KakapoRecovery.org.nz.
About Good Bird Inc:
Good Bird Inc provides behavior and training products for the companion parrot community. These products include Good Bird Magazine, books, videos and parrot training workshops. Discover kind and gentle ways to train parrots to be well behaved, interactive and fun. Visit www.GoodBirdInc.com for more information.
The Gulls Runneth Over
By Susan Wylie
In early June, Le Nichoir, a wild bird rehabilitation center in Hudson,
Quebec received 240 nestling and fledgling ring-billed gulls and 1 herring
gull chick after the birds fell off the roofs of some industrial buildings
in Montreal. Unfortunately this is becoming a common issue in the area with
gulls nesting in inappropriate areas such as on flat roofed, industrial
buildings. These initially offer the adults an apparently great nesting site
with few predators to harass their chicks. Unfortunately, there are other
problems that can result in high levels of chick mortality. After many
attempts at encouraging building owners to return the gulls on the roof and
not intervene, the birds were brought to Le Nichoir for care.
A strategic plan was instantly put into place, volunteers were recruited,
new caging was purchased, large amount of fish were bought (primary source
of diet) and a large aviary was built to ensure that the birds had the
appropriate housing and the best of care.
Overall, of the 240 intakes, 225 healthy and viable ring-billed gulls and 1 herring
gull were released after 6 weeks of care. Le Nichoir worked closely with the
scientific community including biologists from the University of Quebec in Montreal to
have all the birds banded with both metal and identification bands and given
a physical examination. All this was overseen by the Environment Canada
enforcement division, biologists and permit officers to ensure that the
appropriate protocols were taken. Since then there have been multiple
sightings of the gulls, who have seem to have adapted well, including one
recently seen in Florida!
Reuniting and Fostering Wildlife
By Anne Miller (reprinted from the November 2011 IWRC newsletter)
A ground-breaking session on Reuniting and Fostering Wildlife was one of the highlights of the IWRC Symposium in Ft. Lauderdale this November. A panel of seven speakers described methods of reuniting and fostering most species of native North American wildlife in a series of half-hour programs that provided persuasive proof that reuniting healthy young wild animals with parents should be ‘an obligation, not an option’ in nearly all situations. The presentations underscored the fact that juveniles raised in the wild by their own parents learn valuable skills such as prey recognition and predator avoidance that are hard to teach in a rehab setting. Older juveniles also benefit significantly from the protection of parents during the vulnerable period while they are becoming independent.
Thougths on Imprinting vs Socialization
Aardvarks to Zebu: Post 2
Every so often we choose a challenging rehabilitation question and poll two to four experts on the topic. This time, we chose “Explain the difference between an imprinted or socialized animal, or are they the same thing?” and asked it of a behavioral scientist who works at an education and behavioral research facility with captive canids. If you have your own burning question, email me at director@theiwrc.org. The question just might find its way into a future post!
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Aardvarks to Zebu:
Wildlife Rehabilitation Quandaries and Conundrums
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Explain the difference between an imprinted or socialized animal, or are they the same thing?
Pat Goodman – Wolf Park
ABSTRACT: Imprinting and Socialization are closely connected behavioral events. Imprinting occurs during a limited period of time, typically for a short period after an animal is born or hatched. It has a profound effect on the young animal as it matures, determining to what species the infant will show social behavior, and sometimes determining from what species the animal chooses its mates. Knowledge about imprinting is necessary in captive breeding programs if the animals so reared are to be able to choose and mate normally with their own species rather than choosing individuals of the same species as their foster parents.
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While there will be variation depending on the species in question, socializing an animal means to rear, or interact with it in such a way that it can use its repertoire of social signals with other animals. One of the prerequisites for socialization to a species other than its own is a reduced flight distance from that species. Usually an animal is socialized to its own kind by interacting with its parent or parents, and other members of its social group. As it matures, its experience and skills in social interaction expand to include others besides its parents and its siblings or other age mates. Sometimes an animal acquires the ability to respond to the social signals of animals not of its own species, typically through either rearing by foster parents of a different species, or, later in life, repeated exposure and opportunity for non-damaging interactions with another species.
Often socialization to species other than its own is best begun when the animal is very young. Socialization to humans later in life can be more stressful and risky for the animal and human involved, and the range of the social repertoire that the animal shows to humans may be only a fraction of what it would show to its own kind. Wolf Park’s bison, for example, are somewhat socialized to humans through repeated contact paired with special food such as apple slices or sweet feed, and the opening of gates to greener pastures. We do not make attempts to socialize them extensively. They do a little bit of greeting occasionally, sometimes solicit food, and sometimes warn or threaten us. Their social signaling to us is limited compared to the social signaling between us and the wolves.
Imprinting is not, itself, socialization, but it may determine what a young animal becomes socialized to. Imprinting takes place during “critical periods” in the development of an infant animal. Often this period starts very shortly after it is born or hatched. During this time, the infant learns very quickly and very thoroughly to recognize a blueprint for a parental figure. Once this sensitive period is over, socialization to other species, while theoretically still possible, tends to be more labor intensive, less complete, or even impossible given the limitation of resources in the real world – time and skilled caregivers. It also tends to be less effective, less enduring, and may involve more hazards to the animal being socialized and the one doing the socializing. Successful socialization to an animal of a different species, or even its own species, once the sensitive period for imprinting is past, may involve isolating the subject from its own species, and making it dependant on a member of another species for all its social contacts.
In some species this early imprinting also affects mate choice later on, if, in addition to recognizing its parent, the young animal learns to prefer an animal matching its parent’s blueprint as a mate when it matures sexually. Typically it does not imprint on its individual parent as a future mate, but will prefer an animal of the same species as its parent. If it has a foster parent not of its own species, it may reject mates of its own kind when it is an adult, and court members of the same species as its foster parents. Some newly hatched birds can even imprint on inanimate models as parental figures.
In precocial species, which can run around shortly after birth, the infants often show a readiness to follow something that moves in their immediate vicinity. An infant can develop a strong interest in an object and then be less interested in other objects to imprint on. Often this attachment can be enhanced by food rewards. Normally such reinforcement is provided by the mother, who may also reward infants with warmth and pleasant social touch.
The length of this sensitive period varies according to species, and to some extent, on the particular circumstances. According to the Oxford Companion to Animal Behavior (David McFarland, editor, p. 303) “Domestic chicks kept in groups cease to follow moving objects 3 days after hatching, but chicks reared in isolation remain responsive for much longer. In natural conditions the young birds would become imprinted upon one another; chicks and ducklings tend to stay close together, even in the absence of a parent.”
As young animals develop, they often begin to explore, and at some point many of them show signs of neophobia, fear of novel things. This fear can interfere with the young animals’ abilities to form attachments to other animals, including humans. At Wolf Park we discovered that we must take wolf pups away from their mother and start hand-rearing them at 10 to 14 days of age. It is not enough to leave them with a wolf mother who will permit trusted humans to visit daily and handle the pups. The mother-reared pups will show some shortened flight distance from us as they mature but they will not show much of their social repertoire to us and they will not solicit many affiliative interactions; rather, they tend to stay out of reach. If, however, we take the pups away from the mother, but keep the litter together, so that they get near constant contact with their own litter mates for wolf –to-wolf socialization, and give them about 2000 human hours of social contact, which takes more than one human, starting from their removal from their mother at 10 to 14 days old, until they are 16 weeks old, we have wolves who will be able to show the full repertoire of social behavior to their own kind and almost their full repertoire of social behavior to humans as well.
Historically, researchers studying the biology of behavior used imprinting to do experiments that required cross fostering, producing young that were thoroughly socialized to a species not their own. Once these young animals were mature they were willing to mate with members of their foster species, and, in turn their offspring often demonstrated which behaviors were inborn, and which behaviors were learned during individual development. Such research was done a lot with birds, which often imprint on their foster parents’ species as future mates. Such sexual imprinting seems to happen less often with mammals, according to the Oxford Companion to Animal Behavior, but it can occur. Wolf Park once received a wolf pup rejected by his mother, and also he was the only survivor of his litter. Reared in a children’s zoo until he was five months old he had plenty of exposure to humans, but no experience of canines until he came to Wolf Park. I do not recall him ever showing courtship to other wolves, though several of our females found him attractive and courted him. He preferred to court humans, and vigorously rebuffed female wolves.
To sum up, imprinting is a type of learning restricted to certain periods very early in the development of animals. During these sensitive, or critical, periods, an animal’s preferences for social companions, and mates may be determined and it may be difficult, or impossible to change them later in life. In some species, food preferences, and preferences for a certain kind of habitat may also be established very early in life. Animals may be able to imprint on more than just one species. Konrad Lorenz and his students were able to “infiltrate” their goose flocks and study the birds’ behavior at very close quarters by imprinting goslings on humans as well as on geese.
At Wolf Park, whose founder, Dr. Erich Klinghammer, regards Lorenz as a friend and mentor, we do something similar with wolves. Since our wolves are not candidates for release in the wild, and so need not be fearful of humans for their own safety, this type of rearing facilitates our husbandry procedures throughout their lives. It makes additional environmental enrichment opportunities available, since some of our routine maintenance can be a social occasion in which the wolves participate willingly. It reduces the stress of being in captivity and contained in fairly close proximity to the visiting public. Routine care, and even some emergency medical care can be accomplished without tranquilizer guns, nets, etc. If a wolf is driven from its pack, or if it outlives its pack members and we cannot provide it with another compatible wolf as a companion, humans may be that wolf’s only source of friendly social interaction, especially for social touching.
Imprinting does not guarantee that a wolf will always be safe and easy to handle. It does result in a wolf that is typically open to life – long learning about, and, we hope, improvement of its social skills with humans. This openness is achieved and maintained by carefully monitoring our interaction history with wolves, use of some classical and operant conditioning, and attempting to understand their physical perceptions and emotional states, plus their individual developmental and history of personal experience with humans and their environment.











