Because it’s a collection of photos of tiny animals on fingers. This is high-concept stuff, folks.
Frogs, of course, feature prominently in the collection, as do turtles, geckos and… monkeys? Yes, monkeys. Go check it out.
https://gizmodo.com/look-at-the-worlds-tiniest-vertebrate-5874557
https://gizmodo.com/the-smallest-frogs-on-earth-would-have-no-trouble-buddy-5867994
