The Old Snake-and-Egg Question
Burbrink of the City University of New York used DNA sequencing to create an evolutionary tree of more than 4,000 snake ... have vacillated between laying eggs and giving live birth, and climate has been important in driving the switch. In colder times ...
Over Eons, Snakes and Lizards Switch Between Laying Eggs and Live Birth
A study published Tuesday in the journal Ecology Letters reports that the ancestors of modern-day squamates - the collective term for snakes and lizards - likely gave birth to live young, rather than laying eggs like ... these species have switched back ...
Reptilian Ancestors Hated Laying Eggs
In total, about 115 groups of lizards and snakes, or about 2,000 species, have live birth. The other 8,000 species lay eggs - at least now ... defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside ...
Ancestor of Lizards, Snakes Switched Back And Forth Between Laying Eggs And Live Birth
(Photo : George Washington University) A common ancestor of snakes and lizards ... about 115 groups of lizards and snakes, or about 2,000 species, have live birth. The other 8,000 species lay eggs. Their findings are backed by several recent plesiosaur ...
Ancient snakes, lizards gave birth to live young
Most snakes and lizards are known to lay eggs, but in the distant past their ancestors mainly gave birth to live young, just as humans do, a new study suggests ... give birth to live young were thought to have evolved that ability recently.