The first important West Coast mammalogist. Grinnell coined the term "niche" and argued that species with identical niches could not occupy the same geographic regions (nowadays called competitive exclusion). Like many naturalists of his time, he defended the idea that most animals are adapted to local environmental conditions. Grinnell's position at the MVZ was funded by Annie Alexander. Not to be confused with the conservationist George Bird Grinnell.
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