Overfishing, hunting, and pollution all pose threats to seals. Although many species are increasing their populations, some are not as lucky. The Mediterranean monk seal, for example, is listed as endangered by International Union for Conservation of Nature (IUCN).

In order to raise awareness and protect these oftentimes adorable creatures, conservationists celebrate March 1 as the International Day of the Seal.

How much do you know about these marine mammals? Take the following quiz to find out!

(All images via VCG)

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com)