Animals
- Animals
Toothy valves control crocodile hearts
The odd cog teeth of the crocodile heart may be the first cardiac valve known to control blood flow actively.
- Animals
Slavemaker Ants: Misunderstood Farmers?
A test of what once seemed too obvious to test—whether ant colonies suffer after being raided by slavemaker ants—suggests that some of the raiding insects have been getting unfair press.
- Animals
Flowers, not flirting, make sexes differ
Thanks to lucky circumstances, bird researchers find rare evidence that food, not sex appeal, makes some male and female hummingbirds look different.
- Animals
He and she cooperate on anti-aphrodisiacs
Scientists have for the first time identified a chemical that serves as a butterfly anti-aphrodisiac.
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- Animals
Single singing male toad seeks same
Male spadefoot toads of the Spea multiplicata species evaluate male competitors by the same criterion females use.
- Animals
The whole beehive gets a fever…
When bee larvae are fighting off disease, the nest temperature rises, so the whole hive gets a fever.
- Animals
Female owls: First to advertise good genes
Swiss researchers find the first case of a female flashing ornaments that advertise her gene quality to choosy males.
- Animals
The truth is, frogs bluff and crabs cheat
Two research teams say they've caught wild animals bluffing, only the second and third examples (outside of primate antics) ever recorded.
- Animals
Music without Borders
When birds trill and whales woo-oo, we call it singing. Are we serious?
- Animals
Pregnant—and Still Macho
Some of the basic theories of sexual behavior and sexual selection are getting attention thanks to a burst of new studies in the topsy-turvy social world of the seahorse, where the males get pregnant.
- Animals
Hormone still rules no-tadpole frogs
Coqui frogs may skip the tadpole stage, but within the egg, they undergo a metamorphosis ruled by thyroid hormone.
