Puerto Rican Euphonia

The Puerto Rican euphonia is about 10 to 12 cm (3.9 to 4.7 in) long and weighs about 12 to 16 g (0.42 to 0.56 oz). The species is sexually dimorphic. Adult males have an orange-yellow forehead that is separated from the forecrown by a narrow dark blue strip. Their crown and nape are sky blue that extends forward from the latter under the ear coverts. The rest of their head is dark violet blue. Their back is black with a blue gloss; it appears blue in direct light. Their rump and uppertail coverts are bright yellow. Their tail and wing coverts are black with bluish reflections. Voice: Both male and female Puerto Rican euphonias sing, with females typically having the more complex song. The song is a rambling, jumbled series of rapid squeaks, whistles, and tink notes. Another description of the song is "a trilling, tinkling tuc-tuc-tuc..., punctuated with sharp whistles, often in long rambling discourse for up to 20 minutes with little or no pause".