They have a conspicuous reddish head and brown rump and back.

There is a distinct central white streak on the chest and abdomen.

[3] They live in the lowland rainforests along the south bank of the Brazilian Amazon.

They are named after mythical creatures called Saci in Brazilian folklore which wear a red hat to disappear and reappear at will.

Scientists named them so because of their reddish-heads and the fact they eluded discovery for so long.