Optical Illusion is a fun and interesting game which tricks your mind and helps in sharpening your brain and can be used as a mental exercise. (image credit: freepik) You have to find a unique Frog ...

The first species ever to be emergency-listed as an endangered species in Canada, the Oregon spotted frog was on the U.S. candidate list for 23 years before it federal protection in the United States.

CONCEPCIÓN, Chile — For 130 years, a small Chilean frog vanished from scientific view. Biologists searched. Nature enthusiasts kept their eyes open. But Alsodes vittatus remained stubbornly invisible, ...