The behavioral shift from the ground to higher perches apparently caused this remarkable reversal, Losos says, adding that behavioral flexibility may often drive extremely rapid shifts in evolution.

• 从地上栖息向高处的树栖习性转变,显然是引起这种不寻常逆转的原因,Losos说,并补充道生活习性的弹性可能更加导致了进化的迅速。