I'm thinking about majoring in bio at college next year; however, I was curious about what kind of sub specialties exist out there, beyond undergrad education. I see on the forum all the time, people talking about going into high energy physics, or condensed matter physics, or field optics, or particle physics- you get the picture. My question is, what do these equate to in the field of biology? What kind of specialised or deeply intricate areas exist in biological fields? I've heard of cellular and molecular bio for instance, but beyond that, all I know of biology is- biology. I don't hear it referred to in the same way as these physics areas go. Granted, this is PHYSICS forums, but if anyone who may be a grad student, or PhD, who knows of a wide field of opportunities could shed some light on the subject, it'd be greatly appreciated.