Živi fosili
Viri:
- https://commons.wikimedia.org/wiki/File:Limulus_polyphemus_horseshue_crab_on_coast.jpg
- https://commons.wikimedia.org/wiki/File:OdontodactylusScyllarus2.jpg
- https://commons.wikimedia.org/wiki/File:Nautilus_side.jpg
- https://commons.wikimedia.org/wiki/File:Mistukurina_owstoni_museum_victoria_-_head_detail.jpg
- https://commons.wikimedia.org/wiki/File:Neoceratodus_forsteri,_2014-09-19.JPG
- https://commons.wikimedia.org/wiki/File:AmericanAlligator.JPG
- https://commons.wikimedia.org/wiki/File:Crocodylus_porosus_4.jpg
- https://commons.wikimedia.org/wiki/File:Pelikan_Walvis_Bay.jpg
- https://commons.wikimedia.org/wiki/File:Wild_Platypus_4.jpg
- https://commons.wikimedia.org/wiki/File:Short-beaked_echidna_in_ANBG.jpg
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