Environmental factors affecting the onset of breeding in some southern African hornbills, Tockus spp.
D000818:Animals; D001181:Arthropods; D001717:Birds / Q000502:physiology*; D001947:Breeding; D004463:Ecology; D005260:Female; D005523:Food Supply; D008297:Male; D009425:Nesting Behavior; D009929:Organ Size; D006080:Ovarian Follicle / Q000502:physiology; D012621:Seasons; D013019:South Africa; D013696:Temperature; D013737:Testis / Q000502:physiology; D014881:Water Supply; D014887:Weather