A woodpecker's tongue is so long it wraps around the back of its own skull

To reach insect larvae deep inside tree tunnels, a woodpecker's tongue extends far beyond its beak, anchored to a thin, flexible bone structure called the hyoid apparatus that loops up over the skull, around an eye socket, and back down to the base of the beak before unfurling. The barbed, sticky tip then spears or traps prey well beyond what the beak alone could ever reach.

— Lucas Jedlicka et al. (hyoid anatomy studies), Woodpecker — comparative avian anatomy research