These photos span all the sciences but there are some nice biology-related ones here.  They are from National Geographic and definitely cover many of this year's top science stories.

It seems to have been a good year for the cephalopods- the first colossal squid was found and studied, and the creepy looking Magnapinna squid was again captured on video.  My students are really into squid this year, and they were lucky enough to get to dissect one at the Aquarium on our field trip!