On 8 October 1986 a pair of Blackchested Prinia Prinia flavicans in breeding plumage was observed in the camping area of Satara Rest Camp. Kruger National Park. Playing and replaying a tape recording of the call of a Pearlspotted Owl Glaucidium perlatum. in order to see what avian activity would be aroused. https://www.roneverhart.com/Turbosound-TS-18SW700-8A-18-Low-Frequency-Loudspeaker-p31480/