trr-trr-trr.

n.  the short rattling call of the Rusty-Throated Parrotbill bird, as described in A Field Guide to the Birds of China by John MacKinnon.

trrk trrk trrk trrrrk.

n.  the “monotonous, repeated” call of the Orange-fronted Barbet, as described in A Field Guide to the Birds of Borneo, Sumatra, Java, and Bali by John Ramsay MacKinnon.

trrp.

n.  the soft croaking call of the elusive Slate-Headed Tody-Flycatcher bird, as described in A Guide to the Birds of Panama by Robert S. Ridgely.

trrp-trrrrrrrrrr.

n.  the loud, piercing call of the Woodland Kingfisher, as described in Birds of Southern Africa by Ian Sinclair.

trrr.

n.  the alarm call of the Sedge Warbler, as described in A Guide to the Birds of Western Africa by Ron Demey.

trrr trrr trrr.

n.  the grating call of the Dwarf Cuckoo, as described in A Guide to the Birds of Columbia by Steven L. Hilty.

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