Scientists resurrect a 160-million-year-old mammal immune system and watch it evolve
Researchers reconstructed antimicrobial peptides from mammal ancestors dating back about 160 million years and found that some ancient…
Ancient mammal ancestors gave birth to live young, 236-million-year-old fossil finds
A 236-million-year-old cynodont fossil from Argentina contains evidence that the animal may have given birth to live young…
Human childbirth is not uniquely difficult relative to other mammals
Human birth has a reputation for danger. The usual explanation is simple enough: walking upright narrowed the pelvis,…