According to Wikipedia:
The Golden Toad (Bufo periglenes) was a small, shiny, bright-orange toad that was once abundant in a small region of high-altitude cloud-covered tropical forests, about 30 square kilometers in area, above the city of Monteverde, Costa Rica. For this reason, it is sometimes also called the Monteverde Golden Toad, or the Monte Verde Toad. Other common English names include Alajuela Toad and Orange Toad. They were described in 1966 by the herpetologist Jay Savage.
Since 1989, not a single Golden Toad has been seen anywhere in the world, and it is classified by the IUCN as an extinct species. Its extinction is cited as part of the decline in amphibian populations, and may be attributable to climate change brought on by global warming.