Fig. 3From: Combating the Assumption of Evolutionary Progress: Lessons from the Decay and Loss of TraitsDevelopment of lost traits: the hindlimbs of cetaceans. The embryo of the spotted dolphin Stenella attenuata at 24 days (left) has a well-developed early hindlimb bud (h), which has regressed by 48 days (right), while the forelimb bud progresses—note the primordial digits (f) (from Sedm)Back to article page