This is a really good question my mum always asks me when we see Tawny Frogmouths, indeed, I want to know this as well. Are they of any use or is it just there to make them look ridiculously cute?
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Being a nocturnal species which sits & waits for insects to come to it, face bristles might be helfpul for tawny frogmouths in capturing its prey.
Yep Woko thats I want think (and have a vague recollection of being taught). The bristles help them catch insects by guiding their beak towards the movement. Many other insectivorous birds have them too, the flycatchers (and robins too I recall) etc have whiskers - they are more obvious on a tawny though.