Orangutans and Leaves - FOUR PAWS International - Animal Welfare Organisation
Watch: This wild orangutan worked out how to use a carpentry tool she had never even seen before
Clever orangutans invent nutcrackers from scratch
Orangutan - Louisville Zoo
Orangutans instinctively know how to use hammers and do not need to be taught, study reveals | Daily Mail Online
To tool or not to tool? | EurekAlert!
Preserving orangutan culture an ingredient for successful conservation
Orangutans Reveal Ability to Use Stone Tools | Extremetech
Nutcrackers & Whistles: Animals That Use Tools
Bio 342 Fall 06
Insights from orangutans into the evolution of tool use
Orangutan Hats and Other Tools Animals Use - Haynes, Richard: 9781536200935 - AbeBooks
Orangutan Behaviour - Orangutan Foundation International Australia
File:Orangutan using precision grip.jpg - Wikipedia
Orangutan Learns to Saw Wood - YouTube
Funny Orangutan Learns to Saw Wood! | Spy In The Wild | BBC Earth - YouTube
Tool-Using Orangutans Learn Like Humans | WIRED
Inventive Orangutans Make Hook Tools to Retrieve Food | Sci.News
Orangutans Make Tools Better Than Kids, Study Finds
Orangutan using tools (wikimedia commons) - Earth Buddies
Orangutans Make Tools Better Than Kids, Study Finds
