Dogs show signs of self-consciousness in new 'sniff test'

Self-awareness might seem like the most basic part of life to us humans, but it's a surprisingly rare concept when it comes to other animals. While great apes, dolphins, orcas, rhesus macaques, Eurasian magpies, and a single Asiatic elephant have all passed the self-recognition test, everything from pandas and pigeons to sea lions, gorillas, and several species of monkey have failed to show signs of consciousness. Dogs were also on that list of failures - until now.
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