New Study Shows Animal Family Tree Looking Bushy In Places

New Study Shows Animal Family Tree Looking Bushy In Places: "Writing this week (Dec. 23, 2005) in the journal Science, a team of UW-Madison scientists led by Antonis Rokas, now of the Broad Institute of MIT and Harvard, suggests that a branch-by-branch account of animal relationships over a vast expanse of time is difficult to reconstruct because early animal evolution occurred in bunches."