Burlatches

These creatures are the size of large marbles and are covered with bright red burs, which they generally use to cling to tree bark. They have long, thin tongues with which they probe the bark to eat the sap.

Burlatches are friendly to mammals due to their affinity for the natural oils found on hair, which they happily eat when they can get it. They can be found clinging to shaggy animals like goats and bears, and will latch on tight to human hair if they get the chance.

Origin
The Redlands

Trivia
Though Rapunzel does not recognize what they are (she thinks they are rocks), there are burlatches stuck in her hair by the time she reaches the Red Glade.