Tag: wild birds

Migration Season Brings Bird Flu Worries

  • Julie Craves stands in the area where she sets up mist nets during migration to catch land birds. (Photo by Christina Shockley)

Researchers have been monitoring the spread of a potentially deadly strain of avian influenza overseas. Health officials worry the H5N1 strain could mutate into a form that could infect humans. Some researchers say the virus could make its way to the United States as early as this fall… by way of wild migratory birds. The GLRC’s Christina Shockley reports:

Transcript

Researchers have been monitoring the spread of a potentially deadly
strain of avian influenza overseas. Health officials worry the H5N1
strain could mutate into a form that could infect humans. Some
researchers say the virus could make its way to the United States as early
as this fall… by way of wild migratory birds. The GLRC’s Christina
Shockley reports:


Wild birds carry all sorts of influenza viruses. Most are of no threat to
people, but the H5N1 strain is different. When it gets into people… it’s
often fatal. Overseas the strain has killed whole farms of poultry such as
chicken and ducks… it’s also infected other types of animals, including
cats.


The H5N1 strain has not been found in the United States, but most
experts say it’s just a matter of time before it is. Some say infected
domestic poultry or smuggled pet birds will likely bring the virus to the
U.S. Others say the virus could come here by way of migrating birds…
that are on the move now.


Steve Schmitt is the lead veterinarian for Michigan’s Department of
Natural Resources. He says birds from Asia… that are possibly infected
with the H5N1 strain are on their way to Alaska right now. There, they
could mingle with birds that will later fly back to the United States.
Schmitt says there are four major flyways over the U.S.… the Pacific,
central, Mississippi, and Atlantic.


“There are birds that will winter in Asia and then come back and nest in
Alaska. If they bring the virus back with them, then they could transmit
that to birds that are in Alaska that come down any of these four major
flyways, and that of course is a big concern, moving it all over the
country.”


Schmitt says most birds that nest in Alaska use the Pacific flyway along
the Pacific coast… to migrate south to the U.S. and Mexico. He says
that means, if the virus were to come to the United States via migratory
birds, the pacific coast would probably be its first stop in the lower 48.
Schmitt says then, birds that use the other flyways could become
infected.


“Most of the migration is north-south, but you do have a few that will
move – jump over to another flyway, and when that happens, the
potential to move the virus to that new flyway happens. Once it’s in a
new flyway, that north-south movement would take over.”


Programs are underway an Alaska and throughout the United States to
test wild birds for various strains of avian influenza, including H5N1.
Experts say waterfowl and shore birds are the most likely carriers of the
dangerous strain, but some say land birds – such as migrating songbirds –
should be tested, too.


(Sound of birds)


Julie Craves studies land birds at the Rouge River Bird Observatory on
the University of Michigan’s Dearborn campus. She catches and bands
thousands of wild birds each year during their spring and fall migrations.


This year, Craves will participate in a study that hopes to eventually test
hundreds of thousands of birds across the U.S. and Latin America for
avian flu strains.


“It’s just a great opportunity with people handling birds already, we may
find out some very interesting things about which subtypes are present in
land birds, and if indeed this disease does come to North America, we
will have a head start on seeing what types of migratory pathways are
being used by birds.”


Craves says very little is known about how avian flu moves among land
birds, and experts say each time the virus is transmitted to a different
species it mutates, and each time it mutates, the chances are greater that
it will change into a form that’s easily passed among humans. That’s a
big concern, because such a mutation could lead to a quick spread of
human cases across the globe.


But some say that might never occur… they say the strain might be
unable to mutate into one that’s dangerous to humans.


Arnold Monto is a professor of epidemiology at the University of
Michigan. He says there will be a problem if the strain mutates, but it’s
unlikely people will get the virus from migrating birds.


“I doubt very much whether we’re even gong to see even a handful of
cases in the United States, should avian influenza arrive, and it probably
will, with the migratory birds coming down from Alaska, perhaps next
fall.”


Monto says most of the human transmissions overseas have been from
poultry being raised in the back yard, and not from wild birds. That
means visiting the ducks and geese in the park… and feeding songbirds
in the back yard… are not high-risk activities. Monto says people should
take basic precautions, such as washing hands, to avoid contracting any
sort of flu virus.


Many experts say, on the list of things to worry about, catching a deadly
form of avian influenza is no where near the top of the list of dangers.


For the GLRC, I’m Christina Shockley.

Related Links

Keeping Tabs on Eagles Infected With West Nile

  • Crows are not the only birds affected by West Nile virus. Some Bald Eagles have come down with the virus as well. (Photo courtesy of the USFWS)

A wild bird sanctuary is using high-tech tracking devices to keep track of bald eagles recovering from West Nile virus. There’s no medicinal cure for the disease. But volunteers have nursed some bald eagles back to health. They’ve recently released a few of the birds and are watching to see if the disease affects their long term behavior. The Great Lakes Radio Consortium’s Patty Murray has more:

Transcript

A wild bird sanctuary is using high-tech tracking devices to keep track of
bald eagles recovering from West Nile Virus. There’s no medicinal cure for
the disease. But volunteers have nursed some bald eagles back to health. They’ve recently
released a few of the birds and are watching to see if the disease affects their long term behavior.
The Great Lakes Radio Consortium’s Patty Murray has more:


Marge Gibson is crunching through the snow on the grounds of the Raptor Education Group
Incorporated. Several big brown buildings stand stark against the gray Wisconsin winter. They
make up a hospital campus for injured or sick raptors.


(bird chirping)


Gibson approaches a screened in gazebo.


Inside is a very talkative young female bald eagle who’s hopping around on a perch and giving
Gibson a knowing look.


“She’s very vocal and she likes to chat…She’s doing her rendition of ‘poor me, get over here and
pay attention to me’ in bald eagle.”


West Nile Virus began showing up in birds here about two years ago. It’s not known if a bird can
ever fully be cured of it. But in January the sanctuary released three bald eagles that had
sufficiently recovered.


Gibson says it would have been irresponsible to let them go without first observing the lingering
effects of the disease. She’s studying West Nile Virus in eagles with the help of Nick Derene.
He’s a graduate student from the University of Wisconsin, Stevens Point.


Derene logs onto a special website and tracks down one recently released bald eagle that’s been
tagged with a satellite transmitter.


A topographical map shows the region where the bird has settled. A red “x” marks the spot
within 100 yards of where the bird is at that moment.


“And he’s found a nice place on a bluff alongside a stream outside of Black earth About 3 miles
off the highway that runs from Madison to Blackearth.


“Very nice secluded spot atop a hill.”


The satellite transmitters are more accurate than traditional radio monitoring. And they’re a lot
more expensive. Since the Raptor Education Group doesn’t get state or federal funding, Marge
Gibson foots most of the bills herself. The monitoring project could cost as much as 60-thousand
dollars.


Just getting birds to the sanctuary is an involved process. Volunteers pick up birds they think
need help and drive them here. Then Nick Derene keeps an eye on the birds to see if they exhibit
any tell-tale signs of West Nile Virus.


“They’re usually convulsing, they have poor balance, head tremors. Usually
eye problems, sometimes they can’t fly-usually they can’t fly.”


West Nile Virus can also affect an eagle’s voice. That’s a problem because its mate might not
recognize its call.


When the sanctuary staff suspects a bald eagle has West Nile Virus they draw
a blood sample and send it to a local clinic for testing. Once the virus is confirmed, the only way
to treat it is with some tender loving care.


“Hi…lookit”


The birds are kept in cardboard boxes so they don’t expend energy flapping around. And they’re
fed baby food so they don’t waste energy in digestion. When the birds feel up to it they’re put in
an indoor flight room.


It looks like a warehouse-150 feet long and almost three stories high. It’s essentially a rehab ward
for birds who need to test their wings. An immature eagle flies overhead, but he hasn’t perfected
flight yet. He misses his perch, hits the wall and falls to the gravelly floor.


“Flapping, hits wall….is he okay?”


He’s okay but almost looks a little embarrassed.


On the floor of this flight room is a pile of fish, a deer carcass, and the ribcage of an animal that
became eagle chow.


Marge Gibson says she wants the eagles to stick to their wild diet. That’s why the satellite
monitoring program is so important because the birds’ behavior in the wild will indicate the
lasting effects of West Nile Virus.


“We can judge certain things in captivity, in a flight building. Whether the bird is flying well.
But one of the things we can’t judge is his visual acuity, his mental acuity and those things we
have to rely on once they’re released. And the satellite transmitter can follow them to see how
they’re reacting with their own species and other species once they’re in the
wild.”


So far, West Nile Virus is fairly rare in wild bald eagles. In Wisconsin, more bald eagles die
from being hit by cars than they do from West Nile virus.


Nationwide the birds have made a remarkable recovery since being nearly wiped in the 1970’s by
the pesticide DDT. It’s now banned.


It doesn’t look as though West Nile virus will reverse that upward trend.


Marge Gibson hopes to keep tabs on just a few of the eagles infected by the virus to help shed
light on a still mysterious disease.


For the Great Lakes Radio Consortium, I’m Patty Murray.

Related Links

Rescuing Injured Raptors

Owls, eagles, hawks, and other birds of prey have it rough in the modern world. They have to navigate electric wires, cars, and loss of habitat. A handful of volunteers in the Midwest take on the responsibility of nursing injured birds back to health… The Great Lakes Radio Consortium’s Brad Linder has the story of a wildlife rehabilitator in Pennsylvania:

Transcript

Owls, eagles, hawks, and other birds of prey have it rough in the modern world. They have to navigate electric wires, cars, and loss of habitat. A handful of volunteers in the (Great Lakes region/Midwest) take on the responsibility of nursing injured birds back to health… The Great Lakes Radio Consortium’s Brad Linder has this story on a wildlife rehabilitator in Pennsylvania:


(natural sound fading up)


Wendy Looker’s back yard serves as a temporary home for 120 birds, and a variety of other exotic animals. Walking into a sixteen foot cage, Looker opens a box and tries to convince the two small birds inside that it’s dinner time.


“These are fledgling kestrels and they’re just learning to catch food. So we’re tossing baby mice in there just to mimic movement, they’re eating mealworms and crickets, and other things they’re learning to catch.”


By working primarily to rehabilitate birds of prey, or raptors, Wendy Looker has become something of an expert in the region. With a bachelor’s degree in psychology, and some graduate work in animal behavior, Looker has spent most of her life working with animals.


“I worked in zoos for a number of years, and I particularly developed an affinity for owls. I guess I, for whatever reason identify with cranky animal that seem to be misunderstood by people. And I just figured at some point in time, maybe I’d dabble with research, and dabbling became 24-7.”


Ten years later, Rehabitat – a 40-thousand dollar a year non-profit organization, run out of Looker’s back yard – is going strong. Each year Looker and a handful of local volunteers help hundreds of birds recover from injury. It’s often dirty and difficult work for no pay, but Looker says she feels a responsibility to the birds.


“Very few of these animals come in as a result of a failure to thrive, a natural selection sort of a thing. It’s almost always human related, so I feel very strongly that they deserve the opportunity to be given a chance to get back out there.”


Looker says many of the birds brought to her have been hit by cars, have flown into glass windows, or have been caught up in discarded fishing line. But the number one cause of injury for birds is what she calls CBC, or caught by cat.


Even a minor cat bite can be lethal as bacteria infect the wound. Looker says keeping house cats in the house would eliminate countless bird injuries each year.


Feeding the birds at Rehabitat takes 6-thousand dead rodents every week, donated from a local research facility. Looker says in nature, or living in the back of a barn, birds of prey are effective mouse hunters. A single barn owl could save farmers thousands of dollars in crop damage.


“The average owl out in the wild eats about a thousand rodents a year himself, so they’re incredibly efficient and valuable in controlling the rodent population. Eating a thousand rodents, and a single rodent can do about 28 dollars worth of damage to agricultural crops, so that’s a 28-thousand dollar bird, and that’s without him having a family.”


Looker says using rat poison to deal with rodents might not be as effective as having a few raptors around. And if there are birds of prey in the area, it’s likely that they could be susceptible to poison as well.


“Most rat and mouse poisons accumulate in the body of the rodent it takes several days for the rodent to die, and he’s wandering out in the open and it’s very easy pickings for the birds. So we get birds that come in here with what we call secondary poisoning, and they’re seizuring and sometimes we can turn them around and sometimes we can’t.”


“We must have had babies hatching… and let’s go check those babies out….”


While inspecting the newborn barn owls, Looker says some animals spend just a few months at Rehabitat, while others have become lifelong residents due to permanent wing or eyesight damage.


“Our standards for release are extremely high. These birds have a tremendously difficult life out in the wild and they need to be 100% perfect. Because just to have one feather missing compromises the feather next to it, throws them off balance, and may be the difference between life and death for them.”


Not every bird can make it in the wild. A few birds with disabilities such as amputated wings or partial blindness can be used for educational programs. But a number of birds have to be put down every year. Looker says it wouldn’t be difficult to find people willing to adopt injured birds, but Raptors are wild animals that don’t make good pets – and there are few locations with the proper facilities to care for non-releasable animals.


Birds of Prey are federally protected migratory birds, but rehabilitation is a private endeavor. With licenses from the U.S. Fish and Wildlife Service and the Pennsylvania Game Commission, Rehabitat and similar facilities in the state do all the work of nursing injured wildlife back to health for release in the wild


“There are some restrictions in what rehabbers can and can’t do. Obviously we don’t do surgery, but pretty much everything else medically is done on site. It’s pretty grungy work and it’s pretty labor intensive, but it’s also extremely rewarding.”


(natural sound up)


Looker says she’d love to put herself out of business by convincing people to avoid activities which put birds at risk, such as using rodent poisons or letting housecats roam the neighborhood. But as long as there are birds in need of help, there will be people like Wendy Looker to take them in.


For the Great Lakes Radio Consortium, I’m Brad Linder.


(natural sound out)