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Using tools:-http://blogs.scientificamerican.com/thoughtful-animal/2012/07/18/for-chimps-tool-choice-is-a-weighty-matter/?WT_mc_id=SA_DD_20120719

Complete thread:

Chimps \'r not us David Turell 2012-06-25, 12:08 AM
- Chimps \'r not us xeno6696 2012-06-25, 05:20 PM
- Chimps \'r not us David Turell 2012-07-19, 08:09 PM
  - Chimps \'r not us David Turell 2012-11-09, 04:51 AM
- Chimps \'r not us David Turell 2013-09-27, 03:11 PM
  - Chimps \'r not us David Turell 2015-03-03, 06:11 PM
    - Chimps 'r not us David Turell 2017-06-26, 10:57 PM