Difficulty 6 out of 10 (10 = most difficult)
The IUCN Red List is actually a list of all threatened species. Brain Bout keeps this collection manageable by focusing on the animal kingdom. Questions are not yet segregated by classification. So, the Buffy-Tufted Marmoset (pictured) might be an obvious choice in a multiple choice list. In other words, questions in this category are sometimes difficult and sometimes easy.
Play this category despite its difficulties. It will teach you a little something about the vast number of animals facing extinction.
At the time of this writing, this category contains 970 questions.