Common Yellowthroat (Geothlypis trichas)

The male birds with few exceptions have no penis. The mating birds cling and may twist about until the two cloaca are brought together and sperm is transferred to the female.
The cloaca is the posterior opening for a bird's digestive, urinary and reproductive tracts that is used to expel feces and lay eggs.

Red fox (Vulpes vulpes)

Red fox pups spend most of their daylight hours playing near the entrance to their den. As the pups grow older, the parents bring food that is still alive, teaching the young to kill for themselves.