The following cladograms are based on cytology and morphology. Cytology is based on similarities in DNA sequencing and morphology has to do with animal forms and functions. As you can see, animals undergo divergent evolution, going through gradual genetic changes that eventually cause branching, or speciation. For more scientific information on the basis of the sloth cladograms, visit this website: http://3lbmonkeybrain.blogspot.com/2009/02/extinct-or-extant.html.
Natural History
Common Name: Three-toed sloth
The three-toed sloth got the first part of its name simply for having three toes. The name "sloth"