Las vacas forman amistades cercanas y pueden estresarse cuando son separadas

In open terrain a wolf's howl can carry up to about 10 miles. Packs use howls to gather members and to advertise their territory.

Male bowerbirds build and decorate bowers with colored objects. Females choose partners largely by the quality of the display.

Observers have recorded elephants pausing to touch and smell the skulls and tusks of their species, a behavior researchers often describe as mourning.

Each male balances a single egg on his feet and goes without food for about two months while temperatures can fall below minus 40 degrees.