Five facts about Titis, a new species of monkey

5. Scientists have been studying titi monkeys for more than 100 years, but the Urubamba brown titi was only considered a new species recently.

The Urubamba brown titi monkeys have been described and classified since 1914, but they were never considered a new species until recently. They were mistakenly identified in the last century because of the similarities between the species of monkeys. (Source)