[Liberal Classic]

Skeletons have been unearthed which are clearly those of some variety of whale, yet they have a vestigial pelvis that contemporary whales do not. Animals change over time. We can directly observe this in drug-resistant bacteria.

[HankReardon]

Right! A crocodile adapts to live in salt water, but it is still a crocodile, it does not "speciate".

[Mamzelle]

Animals most certainly change over time. Domestic livestock are a fascinating study in these changes--particularly sheep and goats, in ancient breeding laboratories all over the world. There are goats that have long and pendulous ears in India to act as little air-conditioners. Goats in the Alpine with no ears at all, lest they be frozen off! Little white angora goats have long, snowy ringlets that we cut for mohair. Goats in Kashmir for....cashmere. All goats.

Sheep were breed in ancient times for twinning, and now most sheep twin if the shepherd knows what he's doing. Domestic sheep must be shorn regularly, because they have been bred to the point that they cannot naturally shed their fleeces--and will die from suffocation after years of being unshorn. All still--the sheep.

We see the chihuahua, and the Great Dane. All dogs.

Speciation is the question here--not that animals change.