Bar-breasted piculet (Picumnus aurifrons) This is a Rufous piculet, one of the world's smallest woodpeckers - only 8-9.5 cm long - smaller than a Goldcrest (Regulus regulus)! It has an almost non-existent tail and a round body and resembles more of a cupwing than a woodpecker. The bird is orange-red below and olive-green above. Despite being so incredibly small, it can emit a loud drumming sound. (Only the Americas have smaller woodpeckers, the smallest being the Bar-breasted piculet (Picumnus aurifrons) in central South America, only 7.5 cm long.)