A joint project by the University of Illinois and the University of Puerto Rico sequenced the mitochondrial genome of the Hispaniolan solenodon, a shrew-like venomous mammal found in the Dominican Republic. They found that the solenodons are the last surviving members of a mammal lineage that diverged from the other mammals before the extinction of the dinosaurs. Currently the Hispaniolan solenodon is endangered because of human interference causing habitat loss and predation by domestic pets like cats and dogs.
I found this interesting because just last week we were talking about solenodons in my poisonous and venomous animals class, and now here is a news story about solenodon genetics. I also thought it was interesting that even though they look so much like shrews, solenodons and shrew are not closely related at all - at least not since the time of the dinosaurs. This could mean that shrews and solenodons both exhibit well-preserved ancestral characteristics or that the two families underwent a lot of convergent evolution.