Name that skull

The Smithsonian National Museum of Natural History has a great website on human origins. It is a treasure trove of information on human and primate evolution including a 3D digital collection of many artifacts and fossils. My favorite feature is the Mystery Skull Interactive which gives you a set of skulls and asks you to identify them by comparing them side-by-side with skulls that are already known. It is a great way to highlight the meticulous attention to detail that paleontologists and anthropologists need to have to be able to correctly identify fossils.

Catfish preying on pigeons on land

There are plenty of examples of terrestrial vertebrates feeding on aquatic animals, but it is unusual for bony fish to go after animals on land. Some marine predators like sharks and cetaceans, for example, will eat birds in the water and orcas can jump onto pieces of ice to get at seals, but this is the first example of a fish that essentially beaches itself to get at prey on land. As the authors of the study note, these catfish are not native and so this may be an example of a predator taking advantage of a new food source in a somewhat 'artificial' setting.

Dolphins can sense electric fields

Electric fields travel much farther through air than through which is why bony and cartilaginous fishes have exquisitely sensitive electroreceptors but most tetrapods have lost them. Known exceptions are some partially or fully aquatic tetrapods like some amphibians and monotremes. This research shows that dolphins can also be added to the list. The study found that the dolphins have little pits along their face called vibrissal crypts that resemble the ampullae that fish use for detecting electric fields. They also showed that the dolphins could detect electric fields by training them to respond to an electrical signal in the water. This is another example of convergent evolution because the vibrissal crypts are not homologous with the ectroreceptive organs of fish or even of the monotremes. Instead, they are equivalent to the pores that whiskers grow from in other animals. Whiskers are extremely sensitive sensory organs in many animal such as felines and rodents. It seems that in the course of dolphin evolution, the whiskers were lost but the sensory apparatus was retained and co-opted for a new purpose.

The vibrissal crypts (Proceedings of the Royal Society B

Reference:
Electroreception in the Guiana dolphin (Sotalia guianensis) 

Czech-Damal,et al. 

Proc. R. Soc. B 22 February 2012 vol. 279 no. 1729 663-668

New insights into the origin of air breathing

It is fairly well established that the common ancestor of tetrapods and bony fish had air-breathing lungs, but no one really knows how air-breathing really evolved in the first place. This study shows that lampreys have neural circuitry for detecting  carbon dioxide and 'coughing' water out of their lungs when it gets too high. This would be a prerequisite for a tidal breathing system.

Small World

This has little to do with vertebrate zoology per se , but I love microscopy and this contest always has some awesome images. The bat embryos are particularly adorable.
Nikon Small World 2012 Photomicrography Competition

The Hidden Life of the Cell

This video has some excellent animations of various cellular processes. It is also narrated by Dr. Who:
The Hidden Life of the Cell

This Chinese turtle urinates through its mouth

Gross but interesting (from Discover Magazine):

This Chinese turtle urinates through its mouth