It was probably warm-blooded and may have given birth to live young.
They give birth to live young approximately every 23 days.
They also lay eggs, like a bird, instead of giving birth to live young.
They give birth to live young, between six to a record 20 per litter.
They gave birth to live young, just as the Ichthyosaurs had done.
Almost all mammals give birth to live young, but there are a few that lay eggs.
The females of the species give birth to live young.
They give birth to live young; 20 to 40 baby snakes are born at one time.
Mammals give birth to live young because the development takes place internally.
In some they lack eggs and give birth to live young.
