▁tradition ally ▁class ified ▁in ▁the ▁Old ▁World ▁war b ler ▁family ▁Syl vi idae ▁but ▁are ▁now ▁commonly ▁placed , ▁together ▁with ▁several ▁other ▁groups ▁of ▁mainly ▁African ▁war bl ers , ▁in ▁a ▁separate ▁family ▁C istic ol idae . ▁ ▁There ▁are ▁about ▁ 2 4 ▁species ▁of ▁ap alis , ▁the ▁exact ▁number ▁var ies ▁according ▁to ▁differ ing ▁authorities . ▁ ▁The ▁African ▁tail orb ird ▁and ▁long - bil led ▁tail orb ird ▁were ▁formerly ▁considered ▁to ▁be ▁ap al ises ▁but ▁are ▁now ▁often ▁placed ▁either ▁with ▁the ▁tail orb ird s ▁( Or th ot om us ) ▁or ▁in ▁their ▁own ▁genus ▁Art is orn is . ▁The ▁red - front ed ▁prin ia ▁or ▁red - fac ed ▁ap alis ▁has ▁also ▁been ▁moved ▁into ▁a ▁different ▁genus , ▁Prin ia ''' '. ▁Further ▁sh uff ling ▁may ▁be ▁necessary ▁as ▁a ▁recent ▁study ▁found ▁the ▁genus ▁to ▁be ▁poly phy let ic ▁with ▁two ▁species ▁( black - col la red ▁and ▁R uw enz ori ▁ap alis ') ▁only ▁dist antly ▁related ▁to ▁the ▁other ▁three ▁tested . ▁Future ▁studies ▁may ▁result ▁in ▁further ▁division ▁of ▁the ▁genus . ▁▁ ▁Species ▁list ▁ ▁The ▁genus ▁contains ▁ 2 4 ▁species : ▁ ▁Bar - th ro ated ▁ap alis , ▁Ap alis ▁thor ac ica ▁Y ellow - th ro ated ▁ap alis , ▁Ap alis ▁flav ig ular is ▁T ait a ▁ap alis , ▁Ap alis ▁fus c ig