A remarkable 100-million-year-old frog fossil discovered in northwest China is providing scientists with a rare glimpse into ...

When Xenopus frog eggs are experimentally ruptured, their cytoplasm rearranges itself to form compartments similar to cells, according to a study published October 31 in Science. The researchers, led ...

Frogs mate in a position called amplexus, with the smaller male clasping the female from behind in a ride that can last two days or more. As she lays eggs, he expels sperm to fertilize them.

the frog would lay eggs. Frog or "Hogben" tests were commonplace from the 1940s through the early 1960s. The animal's popularity led to both a scientific revolution and a global ecological crisis.

Curare [kyoo-RAW-ree], for example, is found on the skin of colorful poison dart frogs. Another special feature of most amphibians is their egg-larva-adult life cycle. The larvae are aquatic and ...

BREEDING: Relict leopard frogs breed in late January through April, with peak egg-laying activity in February and March. Favored breeding habitat seems to be quiet, shallow pools outside the channel ...

21 in the peer-reviewed journal Evolutionary Systematics. The team collected over 130 of these Ecuadorian tree frogs by combing museum archives, searching the rainforest and raising some eggs in ...