Organisms that aren't closely related may evolve similar traits as they adapt to similar challenges. It's called convergent evolution, and familiar examples include the wings of birds, bats, and ...

For 150 years scientists have been trying to explain convergent evolution. One of the best-known examples of this is how poisonous butterflies from different species evolve to mimic each other's color ...

Alu elements, labeled with green fluorescence in these human chromosomes, make up more than 10 percent of the human genome. (Image from Bolzer et al., (2005) Three-Dimensional Maps of All Chromosomes ...