This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
PSM Evolutionary adaptions of feet. Evolutionary adaptions of feet Extreme form of compressed foot as seen in the deer ox etc adapted specially for land transit Extreme form of expanded foot as seen in the ornithorhynchus etc adapted more particularly for swimming Intermediate form of foot as seen in the otter Foot of frog Here the