Extinction refers to the global disappearance of a taxon, caused by the death of the last individual member. Extinction can be used on many different levels and may relate to populations, groups of populations, species or higher taxa (such as families).

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Do Parasaurolophus have hands with fingers to grab?

http://en.wikipedia.org/wiki/Parasaurolophus#mediaviewer/File:Parasaurolophus_cyrtocristatus.jpg I cannot tell if the hands have fingers strung together to form a hove, or fingers to grab. I have ...