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May 7, 2024, 8:42 pm UTC    
July 11, 2005 03:09PM
[msnbc.msn.com]

Laboratory parrot counts objects, says "none" when objects removed or when faced with an absence of objects on the study area.
Subject Author Posted

African Grey Parrot understands concept of Zero

kenuchelover July 11, 2005 03:09PM

Re: African Grey Parrot understands concept of Zero

Stephanie July 11, 2005 03:36PM

Re: African Grey Parrot understands concept of Zero

Hermione July 12, 2005 04:03AM



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