Beaks and craniofacial structures are two of the mechanisms scientists can use to study evolution in animals on a much shorter scale than the millions of years most evolutionary changes take. Craig ...

A tiny, scaleless, freshwater fish, the highly endangered unarmored threespine stickleback is a fierce protector of its nest, which it defends by dashing forward with gaping mouth and “hackles” raised ...

Twenty billion pieces of DNA in 100 small fish have opened the eyes of biologists studying evolution. After combining new technologies, researchers now know many of the genomic regions that allowed an ...

A little stickleback fish (Gasterosteus aculeatus) nicknamed "Mary" appears to have leaped across a major reproductive divide on the evolutionary tree of life. Stickleback females, like most female ...

Field studies of three-spined stickleback fish dash a textbook example of an evolutionary principle, claims an evolutionary biology team. Males of Gasterosteus aculeatus typically turn red on their ...

Lugging around a tapeworm that’s one-third your body weight can be a real drag. So threespine stickleback fish evolved resistance to tapeworms — but resistance has costs of its own, a team of ...

The endless stream of cars created a white noise, drowning out the lapping of water in San Francisco’s Mountain Lake at the southern edge of the Presidio. The cars zipping along nearby Highway 1 were ...

Abstract The ability of various vertebrates to perceive visual information in the ultraviolet region of the electromagnetic spectrum (300–400 nm) is receiving increasing interest. To date, many of ...