These are ex-voto, offerings to a deity to thank her for something. For example, they could be parts of the body that have been miraculously healed by the saint.
And here even more:
This "hairy girl" is only 8 month old, her name is Tailanha. We met her on a "pau de arara", a funny mean of transport which takes its name from the little stick (pau) on which parrots (arara) sit. Guess why. She was with her parent on the way to Sao Luis. According to her very proud father, she already had two haircut.
This is the pau de arara: