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Watching out for vultures

What’s good for one may not be good for all, especially in the animal kingdom. Consider the case of ketoprofen. Ketoprofen is a drug that, like ibuprofen, provides pain relief and reduces swelling. In India, some farmers give ketoprofen to their cattle and other animals for pain relief.

But giving ketoprofen to cattle may ultimately poison vultures, according to a recent study. Vultures are giant, flying scavengers that eat the carcasses of dead animals, including cattle. For farmers, vultures act like nature’s janitors. The birds’ feasts mean that farmers don’t have to figure out how to dispose of the bodies of dead animals. And vultures eat fast: Dozens of birds could take care of a dead animal in 20 minutes.

When a vulture eats a dead animal, however, it may also end up eating medications that were given to the animal. In the case of ketoprofen, this is a big problem, according to a study by Richard Cuthbert and his fellow researchers. Cuthbert is a zoologist, or a scientist who studies animals, in England. He recently led a team of scientists from around the world in a study of how ketoprofen affects vultures. He and his team found that even small amounts of the drug can kill a vulture.

In their experiment, the scientists found that vultures died after being given ketoprofen directly, or after eating the body of an animal that recently had been given the pain medication. It didn’t take much: Vultures died after consuming less than one-millionth of their body weight in ketoprofen. That amount shows that even veterinarians should be very careful about giving ketoprofen as a medicine to birds, the team said in its research paper on the work

This isn’t the first time farmers have accidentally poisoned vultures. Another drug that reduces swelling, called diclofenac, became popular among farmers about 20 years ago. But that drug also turned out to be toxic to vultures, and as a result three different species are on the verge of becoming extinct. In 2004, Lindsay Oaks, a veterinarian at Washington State University, helped connect the vulture decline to the use of diclofenac. He told Science News that even a small number of tainted carcasses could cause a large decline in vulture populations. Since Oaks’ study, countries such as India, Pakistan and Nepal have laws against making diclofenac for animals.

The way a drug given to a cow can end up killing a vulture is one example of how interconnected the food chain is.  Scientists such as Cuthbert look at the effect of medicines on vultures to learn information that will help in preventing the type of disaster diclofenac has already caused. Prevention would not only help the vultures, but would also help the farmers, who now have to deal with carcasses that sit rotting.  Cuthbert says even though vultures may be rather repulsive, they do important work for the planet — and they’re connected to other species.

“With their heads in a carcass, they may not be that attractive, but they’re doing their job,” Cuthbert told Science News. Plus, he added, “They’re mind-blowing flyers.”


POWER WORDS

food chain A succession of organisms in an ecological community that constitutes a continuation of food energy from one organism to another as each consumes a lower member and in turn is preyed upon by a higher member.

veterinarian A scientist who studies the causes, diagnoses and treatments of diseases and injuries in animals, especially domestic animals.

zoology The branch of biology that deals with animals and animal life, including the study of the structure, physiology, development and classification of animals.

scavenger An animal, such as a bird or insect, that feeds on dead or decaying matter.

carcass The dead body of an animal, such as one slaughtered for food.

Watching out for vultures
Watching out for vultures








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