- Jul 2017
- Crows nest
I think there could also be the case that we are seeing an animal in evolutionary transition. At one point whales still had visible vestigial hind legs, and if their evolution had started a few tens of millions of years later than it did, then we may see whales at that stage now and wonder what use these vestigial limbs were, without the benefit of seeing, as we actually do of course, where evolution led them. Maybe abelisaurs and tyranosaurs were in the process of completely loosing their arms, but due to the extinction we only see them forever frozen at this transitional stage. Just as the potential supreme rulers of the planet, the troodontids, became frozen in time before they invented lasers and such....Of course there doesn't need to be a selective pressure driving every genetic change, or always a reason. A mutation can propagate if it doesn't affect the animals fitness, so long as it is able to pass those genes on.