How do scientists measure animals’ intelligence?

Question

How exactly do scientists measure this intelligence across different species? What methods, tests, or observations do researchers use to assess the cognitive abilities of animals? And especially I am curious about how do they range animals according to their IQ level? How can one compare raccoons (with their physical ability to do something using their fingers) and, for example, pigs?

In: Planetary Science

Answer 1

The tests are for the most part the same as ours. The real trick is getting them to hold the little #2 pencils in their paws.