As the Republican runoff election is underway in Texas, border security is once again front and center as a key topic. Incumbent U.

Sharks might not be a natural biological group, with most species potentially closer kin to rays than to an oddball group of sharks.

More than 3 million years ago, when our ancient ancestors embodied by the iconic Lucy were roaming the African landscape, they would have feared a big, bad crocodile with a prominent lump on its head, ...

Many of the most damaging invasions do not simply subtract species; they fundamentally remodel the environment, altering habitats, rewiring interactions, and shifting processes in ways that species ...