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Lesser Mouse Deer, Tragulus kanchil
| Masai giraffe, G. c. tippelskirchi
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From Sheep and Cattle to Giraffes, Genome Study Reveals Evolution of Ruminants | UC Davis
The ruminants are a large and very successful group of mammals ranging in size from the tiny lesser mouse deer of Malaysia to the giant African giraffes, and occupying a wide range of ecosystems. A characteristic of this group is a four-chambered stomach modified to digest a high-cellulose diet with the aid of specialist microorganisms, regurgitation and re-chewing of the food (chewing the cud), a pair of horns or antlers used for defence and sexual display and teeth adapted for eating grass and leaves.
This group emerged between 32 and 39 million years ago and has provided several important domesticated animals such as cattle, sheep and goats, but how exactly they are related had not before been fully worked out.
Now a team of scientists led by Wen Wang and Guojie Zhang at the Kunming Institute of Zoology, China, and Rasmus Heller at the University of Copenhagen, Denmark, and including Professor Harris Lewin at the UC Davis Department of Evolution and Ecology and Genome Center, Davis California, has gone some considerable way to working out a phylogenic tree for this group.