THEY GRIEVE THEIR DEAD

The social ties between dolphins are strong enough that they have been observed exhibiting behaviors that resemble grief in humans. Dolphin mothers have been seen carrying their dead infants in their mouths or on their backs for around a week, and even adult males have been seen holding dead calves in their mouths.

Cetacean biologist Giovanni Bearzi and his colleagues have labeled this “post-mortem attentive behavior” and found a correlation between grieflike displays and brain size and complexity, according to a 2018 article in Sciencemag. com, written by Virginia Morrell .