The vulturine guineafowl (Acryllium vulturinum), named for their bald head and neck which resembles a vulture, is often referred to as the "royal guineafowl" because it tends to have the most striking appearance. It is the largest extant species of guineafowl - it has a longer wings, neck, legs and tail than other guineafowl. The adult has a bare blue face and black neck, and although all other guineafowl have unfeathered heads, this species looks particularly like a vulture because of the long bare neck and head. It is an excellent runner but rarely flies, with the exception of reaching nocturnal roosting perches. Males tend to be very aggressive towards the hens most of the time. One effective way to distinguish the sexes is by observing each individual's body posture. The males tend to carry their heads high and attempt to look as big as possible. Females, on the other hand, tend to adopt a submissive posture. It is a resident breeder in northeast Africa, from southern Ethiopia through Kenya and just into northern Tanzania.