One of the easiest intelligence tests is the “Mirror
self-recognition test”, it’s on a very intuitive level and has something to do
with self-awareness. The test is to put a red mark on your face, you pass if
you recognize that it’s on your own face. Children begin to pass at around 18
months old. Chimps, dolphins, elephants and magpies: all of them passed the test.
However, some monkeys don’t pass the test, even though they’re widely seen as
intelligent animals.
