New Mammalian Phylogeny

When many people hear about the ‘martix’ they think of Keanu Reeves or Laurence Fishburne in the role of Morpheus. But to Mark Springer and his colleagues, the matrix is the culmination of about five years of painstaking research. It is a large and robust DNA matrix Read More...

Pre-natal Hormones Shape Female Social Interactions

In many mammals the female uterus is divided into two horns, a right and a left. Several embryos develop along the length of each horn. For example, a pregnant dog might have four fetuses developing in the right uterine horn and three more developing in the left horn. Thus, each fetus has neighbors. However, the Read More...

Can Hyenas Count?

During a pivotal scene in West Side Story, the Jets and the Sharks meet to prepare to rumble. As the gangs assembled each side likely tried to assess their opponent’s strength. This ability to assess numerical advantage is highly advantageous in any species where conflict Read More...

Sex at Sea – How to Avoid the Beach Master

The southern elephant seal, Mirounga leonina, is a textbook example of an extremely polygynous mammal. As the breeding season begins dominant males fight for control of dozens to hundreds of females on his section of beach real estate (Figure 1). Females within Read More...