Although there is limited research on the effect of light on ostriches, there is no
reason to suggest that ostriches are any different. Undoubtedly, the photoperiod is the
strongest stimulus to breeding. It is must be borne in mind, however, that wild ostriches
are known to be opportunistic breeders. In addition to changes in day length
(photostimulation), breeding can be triggered off, to a limited extent, by a number of
other physical and psychological factors, including changes in ambient temperature,
abundance of vegetation and availability of drinking-water. These factors act in
combination with day length either singularly or in association with other related factors
to control the onset and termination of breeding. A rainfall early in spring, for example,
indicates the possible abundance of both water and lush green vegetation and would thus
enhance the effect of photoperiod and further stimulate early breeding. Similarly, warm
days help to extend the breeding season slightly.