 The pygmy three @-@ toed sloth is one of the four members of the genus Bradypus , and is classified under the family <unk> . A 2004 phylogenetic analysis suggested that Bradypus is sister to all other <unk> . The generic name Bradypus is the combination of two Greek words : <unk> ( " slow " ) and pous ( " foot " ) . The specific name pygmaeus comes from the Greek <unk> ( " as small as a fist " ) . ' Monk sloth ' and ' dwarf sloth ' are two other names for this sloth . 
