I doubted. Peregrine Falcon is good at capturing open country birds but not very good at well vegetated areas. The usual prey items of Crested Goshawk are likely to be lizards, insects and even bats. The "absence" of small birds like JWE is unlikely driven by the raptors.
But their activities should be affected by nearby raptors. The "absence" of birds in a small island should be affected by various factors, e.g. food availability and human activities etc.
I guess they are not really absence, they may just move to another part of the island or hide inside the bush due to the two raptors.
Just like the birds at TPK. Sometimes they are very easily to be seen but sometimes TPK is dead and silent.
How about moulting? I was told during the moulting period, they are relatively silent.
