So they did it with mouse pups, kittens.

And as a result, when those rats grow up, their pups experience retarded growth and development because they can't make enough milk to nourish their pups.

And I went to the island of Bimini, in the Bahamas, to work with lemon shark pups.

The problem is that these pups need a stable platform of solid ice in order to nurse from their moms.

Of those rats that don't abort, atrazine causes prostate disease in the pups so the sons are born with an old man's disease.

We don't know where they migrate to or from, where they mate, where they have their pups, and yet, hammerhead populations in the Atlantic have declined about 80 percent in the last 20 to 30 years.

And because I'm an underwater photographer, I wanted to do this story from both above and below, to make pictures like this that show one of these little pups making its very first swim in the icy 29 degree water.

The story I wanted to do initially was just a small focus to look at the few weeks each year where these animals migrate down from the Canadian arctic to the Gulf of St. Lawrence in Canada to engage in courtship, mating and to have their pups.

This is a photo that I made showing one of these pups that's only about five or seven days old still has a little bit of the umbilical cord on its belly that has fallen in because of the thin ice, and the mother is frantically trying to push it up to breathe and to get it back to stable purchase.