Ravens are part of the crow family. Crows mate for life and if their partner dies suddenly, they use their beak to pull out their own feathers as a sign of distress. The social intelligence hypothesis states that the selective pressures of living in social groups and having to meet the challenges of a social circle (eg. remember alliances, remember betrayal, remembering friendships etc.) has favored the evolution of a brain which can perform better cognitive processing. This is the reason it is ...
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