File:The study of animal life (1906) (14770062684).jpg - Wikimedia

File:Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals (1907) (14773037152).jpg - Wikimedia Commons

File:Figure 46 01 03.jpg - Wikimedia Commons

File:Naturalis Biodiversity Center - RMNH.AVES.110083 - Camptorhynchus labradorius (Gmelin, 1789) - Labrador Duck - specimen - lateral view.jpeg - Wikimedia Commons

A Zoo Study (3589382724) - PICRYL - Public Domain Media Search Engine Public Domain Search

Animal - Wikipedia

File:Figure 07 02 02.jpg - Wikimedia Commons

File:Figure 10 01 03.jpg - Wikimedia Commons

Animal - Wikipedia

File:Biology of the vertebrates - a comparative study of man and his animal allies (1949) (20357087366).jpg - Wikimedia Commons

Life History DBs

Janzen Lab of Ecological and Evolutionary Herpetology

When did animal life begin on Earth? Oxford study brings us step closer to answer - Study Finds