Animals reproduce in one of two distinct ways: egg-laying or live birth. By studying an evolutionarily recent transition from egg-laying to live-bearing in a marine snail, collaborative research has ...

A photo of the embryos that developed inside a live bearing female snail. Many different stages of development can be observed from just-fertilized, to fully-hatched miniature snails. Animals ...

Next week the snails arrive. Mr. Turner will bring them in from his garden in Noe Valley, one for each of his second-graders at the Tenderloin Community School. He does this every May, when the school ...