Blog
Product updates, guides, and engineering notes from the team.
How Many Species of Hummingbirds Are There?
The IOC World Bird List recognises 366 hummingbird species. Other checklists count between 338 and 373. Here is why the number differs, and what drives it up and down.
How Many Species of Monkeys Are There?
The Mammal Diversity Database recognises 329 living monkey species — 165 Old World and 164 New World. Older sources say 260 or 270. Here is why the numbers differ.
How Many Species of Ducks Are There?
About 120 species are ducks in the everyday sense, out of 174 species in the family Anatidae recognised by the IOC World Bird List. Why the answer depends on where you draw the line.
How Many Species of Crabs Are There?
There are over 7,600 species of true crabs, plus a few thousand crab-like animals that are not true crabs at all. A look at the real numbers and why the group keeps growing.
Animals That Start With X
Genuine animals beginning with X, including the xerus, Xenopus, the X-ray tetra and the xoloitzcuintli — plus an honest explanation of why the list is so short.
Animals That Start With N
Around 35 animals beginning with N, grouped by mammals, birds, reptiles, amphibians, fish and invertebrates — from the narwhal and numbat to the nudibranch.