Male hippos can weigh up to 9,920 pounds while females weigh around 3,000 pounds, according to PBS." The animal's scientific ...

WASHINGTON— Animal protection and conservation groups sued the U.S. Fish and Wildlife Service today for missing its deadline to decide whether the common hippopotamus should be protected under the U.S ...

WASHINGTON— After a petition and threat to sue from animal protection and conservation groups, the U.S. Fish and Wildlife Service today announced that the common hippopotamus may qualify for ...