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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Is high metabolism linked to high evolutionary turnover?

I recently read The Dinosaur Heresies by Robert T. Bakker, a 1986 popular science book presenting arguments for an active lifestyle and high metabolic rate in dinosaurs. One of the arguments that ...
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Ice Age Extinctions - Man vs Nature?

As the most recent "ice age" (the Pleistocene) came to a close, changing climatic conditions obviously changed the playing field, driving some species to extinction. But humans were spreading around ...
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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 ...