Puerto Rican crested toads were thought to be extinct from 1931 to 1967, when a population was discovered in northern Puerto Rico. Today, the International Union for the Conservation of Nature ...

The native Puerto Rican toad has long been endangered on the island thanks to habitat loss and invasive species. Yet fame, ...

When the first Puerto Rican crested toad conservation efforts began in 1980, Brookfield Zoo was one of two U.S. institutions to receive offspring from four breeding individuals at the Puerto Rico ...

Olaf, a critically endangered Puerto Rican crested toad, shown here at the Forth Worth Zoo, is one of more than 300 toads born via in vitro fertilization as U.S. scientists attempt to save the ...

In this Sept 25, 2019 photo, Olaf is held by primary Puerto Rican crested toad zoo keeper Kelsey Barron, at the Fort Worth Zoo, in Fort Worth, Texas.

Puerto Rican crested toads are bumpy, lemon-size creatures with bony ridges on their... Oakland Zoo's push to save Puerto Rican crested toad SF Gate Logo Hearst Newspapers Logo ...

The Puerto Rican crested toad has declined due to introduction to Puerto Rico of the marine toad and other invasive species, which eat the toads and tadpoles and outcompete them for resources.

When the first Puerto Rican crested toad conservation efforts began in 1980, Brookfield Zoo was one of two U.S. institutions to receive offspring from four breeding individuals at the Puerto Rico ...

The toad, named in honor of the frozen semen he came from, is the first of more than 300 Puerto Rican crested toads that hatched after the first attempt failed, Diane Barber, ectotherms curator at ...

The Puerto Rican crested toad was described in 1868 and once flourished in Puerto Rico and Virgin Gorda. However, due to habitat loss and the introduction of other species, ...

SAN JUAN, Puerto Rico (AP) — A critically endangered Puerto Rican toad was for the first time born via in vitro fertilization as U.S. scientists attempt to save it from extinction, officials ...

Mike Masellis, Brookfield Zoo's lead animal care specialist for aquatics, looks over hundreds of critically endangered Puerto Rican crested toad tadpoles, after counting and collecting them on ...