ved ▁b ills ▁and ▁a ▁h unch ed ▁post ure . ▁Their ▁heads ▁are ▁small , ▁but ▁their ▁eyes ▁are ▁relatively ▁large , ▁making ▁them ▁look ▁" good - n ature d ". ▁The ▁pl um age ▁is ▁soft , ▁res emb ling ▁fur ▁or ▁vel vet ▁on ▁the ▁head ▁and ▁neck . ▁It ▁is ▁mostly ▁black , ▁with ▁pur ple , ▁green , ▁or ▁bronze ▁ir ides c ence , ▁particularly ▁on ▁the ▁wing ▁cover ts ▁and ▁the ▁lower ▁neck . ▁In ▁the ▁best - known ▁tax a ▁the ▁secondary ▁and ▁t ert ial ▁flight ▁fe athers ▁are ▁white , ▁grey , ▁or ▁green ish ▁to ▁black , ▁and ▁hair like , ▁falling ▁over ▁the ▁lower ▁back , ▁which ▁is ▁the ▁same ▁colour . ▁These ▁colours ▁give ▁the ▁three ▁generally ▁accepted ▁species ▁their ▁names . ▁ ▁Tax onomy ▁and ▁system at ics ▁Trad itionally ▁only ▁three ▁species ▁of ▁tr ump eters ▁have ▁been ▁recogn ised . ▁In ▁ 2 0 0 8 ▁a ▁review ▁of ▁the ▁morph ology ▁of ▁the ▁dark - wing ed ▁tr ump eter ▁resulted ▁in ▁the ▁recommendation ▁of ▁splitting ▁it ▁into ▁three ▁species . ▁In ▁ 2 0 1 0 ▁a ▁review ▁of ▁the ▁ph y log eny ▁and ▁bi oge ography ▁of ▁all ▁members ▁of ▁the ▁family ▁resulted ▁in ▁a ▁total ▁of ▁ 8 ▁species , ▁including ▁two ▁in ▁the ▁grey - wing ed ▁tr ump eter ▁complex , ▁two ▁in ▁the ▁pale - wing ed ▁tr ump eter ▁complex , ▁and ▁four ▁in ▁the ▁dark -