By Sarah Taylor and Robert Boswell
If you were one of the black ducks that stops over for rest in the winter at the Chincoteague National Wildlife Refuge you might find a welcome meal of corn waiting for you along one of the waterways. No problem getting to it, just swim through an open space in some wire and there it is.
But guess what. You have just been trapped. That open space you swam through to get to the corn only goes one way. You cannot swim back out.
You will, however, get to help from the biologists at the Chincoteague National Wildlife Refuge who are trying to learn more about black ducks. Chances are you will be taken out of the trap, a big wire cage, the next morning and cuddled safely in someone’s arms. You will be written up in a special record book. Then you might have a small metal band carefully attached to one of your legs before you can fly away to another spot on the refuge, to wait for spring and the long journey north to feeding grounds in Canada.
We got a ride out to the duck catching area from Janelle Walters, a biological science technician at the refuge. She took us on the service road that runs nearly eight miles out into the northern part of the refuge. On the way we saw the famous ponies, egrets and other birds, and even a baby box turtle.
On the way out Ms. Walters explained that capturing the black ducks helps keep track of their population within the salt marshes of Assateague Island. “The grasses in the salt marshes are very critical habitat for black ducks to feed and rest during their migration,” she said. “We capture them to gather scientific data,” said Ms. Walters.
On the day we were along with her we didn’t actually see any ducks. She said they had stopped coming the week before, near the end of the catching time, March 20. But she showed us how the whole process works.
To band the ducks they first have to catch them. So they build big cages out of wire and metal. The cages are made so the ducks can get inside but can’t get out until they are taken out. The cage is placed in shallow water and the biologists then trick the ducks to come in by adding corn as bait.
The bait the biologist use to capture the black ducks will catch the duck’s eyes and, while the duck is swimming. it will go to the corn which is inside the cage. Soon other ducks swim in and all of them will become part of the research.
Traps, she said, are baited either very early in the morning or late in the afternoon. Either way the biologists show up within hours. Ms. Walters showed how they can close the top part of the trap and lift it by a handle out of the water onto a nearby location on land. Then, one by one, the ducks can be taken out and calmed by cradling them. “They really calm down once you are holding them. They feel relaxed.”
The tools and record books used by the biologists are kept in a backpack, including a string of metal bands. The first job, said Ms. Walters, is find out if you have a “clean” duck. This is a duck that has not already been banded. Next they check their sex, age and if they are healthy.
Then, using a special tool called a crimper, they open the right size band and place it on a duck’s leg. The crimper is set to allow just the right pressure to close the band without injuring the duck.
Ms. Walter said they work in teams. They double check each action, calling out, for example, “Putting on band 56.” Each band has a unique number.
She said the information collected is used by a lot of people. “Migratory information is really important,” she said.
Black duck banding also takes place on Fisherman’s Island on the lower part of the Eastern Shore. Wildlife specialists from the state also help out with banding on the Assateague refuge.
Kevin Holcomb, the supervisory wildlife biologist, told about another way of catching ducks. The wire cage is called a “confusion trap” but they also use “rocket traps.” With this method ducks go to the bait and then small rockets are fired which carry a net over the ducks.
Mr. Holcomb said other bird banding takes place on Assateague. He said Dick Roberts has been catching and banding small birds for years. “He has a wealth of knowledge and is a volunteer not affiliated with the state.”
All of the information collected by Mr. Roberts and by the refuge biologists is sent to the Bird Banding Laboratory in Laurel, Maryland.
Sarah is a 5th grade student at Kegotank Elementary School near Chincoteague Island and Mr. Boswell is publisher of Wild Pony Tales.
BLACK DUCK FACTS:
· The Chincoteague National Wildlife Refuge is on the Atlantic Flyway, the main north-south migration route for birds.
· The first record of a metal band attached to a bird’s leg was about 1595 when one of Henry IV’s banded Peregrine Falcons was lost in pursuit of a bustard, a large bird, in France. The falcon showed up 24 hours later 1350 miles away.
· In 1899 a Danish school teacher, Hans Mortensen, began placing aluminum rings on the legs of European teal, pintail, white storks, starlings and hawks. He wrote his name and address on the bands in hopes they would be returned to him. His system of banding became the model for banding done by biologists today.
· Between 1909 and 1939 a pioneer in bird banding, Jack Miner, established a waterfowl sanctuary in Ontario, Canada and banded 20,000 Canada Geese. Many bands were returned to him by hunters.
· The North American banding program grew out of work by the Bureau of Biological Survey and Canadian Wildlife Service. Bird banding data from North America is now sent to the Bird Banding Laboratory in Laurel, Maryland.
· Banding research has revealed that some species of birds go south in one pathway and return north by another pathway.
· The Arctic Tern makes the longest migration flight of any living species, making an annual round trip of 25,000 miles.
· Bird banding allows researchers to reconstruct the movements of the individual bird.