Some mammals can hit pause on a pregnancy—understanding how that happens could help us ...

Seals give birth only when conditions are right. After mating, a female seal can delay implantation of the embryo in the ...
CNN

Newly identified species of Tanzanian tree toad leapfrog the tadpole stage and give birth ...

Scientists have newly described three extraordinary species of tree toad that leapfrog over the egg-to-tadpole stage. The females give birth on land to dozens of toadlets, each measuring just a few ...