The Fort Worth Zoo is celebrating Endangered Species Day by releasing over half a million endangered Houston toads, tadpoles, and eggs into a protected site in Bastrop County.

Endangered Houston toad eggs, tadpoles and toads were released into their native range on a designated release site in Texas.

The Niassa Carnivore Project, a partner of the Houston Zoo since 2009, was attacked in April, with two killed and at least ...