Menacing mating game: Frogs fear bats!

Menacing mating game: Frogs fear bats!
Mating displays attract females — and predators. A Panama bat listens for the túngara frog. If it “sees” ripples the frog makes on the pond, it swoops in for lunch! More »

Sweet and sour!

Sweet and sour!
Study finds added sugar — equal to 3 cans of soda a day — doubles death rate among female mice, and impairs male reproduction. Even if mice aren’t people, yikes! More »

To play, and therefore to mate

To play, and therefore to mate

Are we affecting the character of future generations by the way we choose mates? If choosing attractive mates tends to make the grandchildren more attractive, what about choosing mates who like to laugh or have fun? More »

Live birth in ancient reptile

Detail from schematic diagram

Classroom Activity Page: The fossil of a plesiosaur, which was a large, dangerous predator of the seas between 200 and 85 million years ago, showed strong evidence of being pregnant. Evidence for pregnancy included the location of the unborn plesiosaur, its size, and the fact that its bones were not fully hardened, or ossified. The find helps flesh out the evolutionary transition between laying eggs and live birth. More »

Song of the crocodile

How does momma croc know when to dig up the young? How do the embryos know when to start hatching? The secret’s in the song… More »

Dolly the clone: 10 years later

In 1997, Dolly was BIG NEWS. What did Dolly teach? Why did cloning attract so many oddballs, and what is the status of reproductive cloning and therapeutic cloning? The Why Files honors Dolly with a 10-year lookback. More »