Two creatures that cannot interbreed, even if they resemble each other, must belong to different species. As is often the case in evolution, the rules of speciation are by no means ironclad.

Officially, Earth boasts roughly 2 million species. Unofficially ... as in the other tiger-cats," de Oliveira says. "That's totally different." However, the researchers estimate that the current ...

This summer, we’ll look at three shark species with notorious reputations: tiger sharks, great whites and oceanic whitetips. We’ll meet scientists who are shedding new light on these enigmatic ...

With its wide mouth charmingly outlined in yellow, the California tiger salamander always looks like it's smiling. But this beautiful amphibian is a discriminating species that can only thrive in ...

The third Sundarban Bird Festival recorded 154 bird species, promoting avifauna through estimation exercises and bird ...

Adilabad: A rare fungal species named shuttlecock mushroom was found in Kawal Tiger Reserve in Telangana. Venkatesh Anagandhula, a regional coordinator of Hyderabad Tiger Conservation Society ...

With its wide mouth charmingly outlined in yellow, the California tiger salamander always looks like it's smiling. But this beautiful amphibian is a discriminating species that can only thrive in ...