Plumage development and visual communication in the Greater Kestrel Falco rupicoloides near Pretoria, South Africa

摘要: Kemp, A. C. 1999. Plumage development and visual communication in the Greater Kestrel Falco rupicoloides near Pretoria, South Africa. Ostrich 70 (3&4): 220–224. I trapped, marked, sexed examined moult softparts on 101 free-living Kestrels Africa, during 1975–1988.1 collected plucked one kestrel to determine number mass of its feather tracts, as an index materials invested moult. also 72 museum specimens from southern Africa observed plumage softpart changes four captive birds. During 1975–1979,1 made focal observations adult kestrels (males 181 h, females 262 h) recorded monthly samples their behaviours nearest minute. can be aged for three successive stages (juvenile, post-juvenile, adult). with potential signal effects involved only small investments at post-juvenile first moults (3.7...