A border collie named Chaser has learned over 1,000 words -- more than any other animal

Psychologists Alliston Reid and John Pilley of Wofford College in Spartanburg, S.C., wanted to test if there was a limit to the amount of words a border collie could learn, so they taught Chaser the names of hundreds of toys, one by one, slowly and patiently, for three years.

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