Los Angeles Zoo sees first hippo birth in 26 years

The Los Angeles Zoo has received a real treat for Halloween—the birth of its first hippopotamus in 26 years. It was a bit of trick, too, because the mother was on birth control.

Fish exposed to estrogen produce fewer males

Water tainted with even a small concentration of human hormones can have profound effects on fish, according to a University of Cincinnati biologist.

page 2 from 5