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Hippo "sweat" contains substances that fight microbes and screen out ultraviolet light.
Researchers are tracking down why some types of cicadas emerge in vast numbers only once every 17 years.
The skin of some frogs becomes poisonous after they eat certain kinds of ants.
Whale watcher boats may be so noisy that killer whales must change their calls to be heard.
Analyzing dog DNA is helping to explain the origin, behavior, and diseases of dogs.
Females may get male baboons to tone down violent behavior and become more cooperative.
A hummingbird has an unexpectedly flexible lower bill to help it catch bugs.
Food-snitching birds may drive wolves to hunt in large packs.
Learning more about sea otters can help rescue the animals and save coastal ecosystems.
An African forest bird can tell which monkey alarm calls to pay attention to.
Scientists have tweaked a butterfly's genes to make its eyes glow green.
From agriculture to medicine to law, animal cloning to create genetic twins could change our lives.