Dozens of times over the eons, rove beetles have made complex, independent adaptations to live inside the nests of ants — the phenomenon of convergent evolution. Biologists want to know if this shows patterns at work in natural selection.
Evolution made insect ears many times over, resulting in a dazzling variety of forms found in spots all over the body. Biologists are digging deep into some of those ears to figure out how and why they came to be.
COMIC: The feisty orange-black butterfly uses a toolbox of biological tricks to find its way down to Mexico for winter and flap north again in spring. Here’s how scientists figured out those tricks — and what they don’t yet understand.