2) Golden Toad
It's difficult to determine the exact cause of the golden toad's sudden extinction, but there was a time when the little guys were ubiquitous in Monteverde, Costa Rica. Breeding primarily during the rainy seasons, climate change brought on by the arrival of El Niño may have dried out the puddles golden toads used to lay eggs. This lack of moisture and rising temperatures likely created an ideal environment for bacteria and fungi to flourish, easily infecting golden toads whose immune systems were affected by increased UV exposure. Adding to that the use of pesticides, golden toads had vanished completely by the late '80s.