An Angolan dwarf galago makes a call in Angola, West Africa.

Vocalisation Crescendo Twitter By Angolan Dwarf Galago (G.kumbirensis)

Walnut sphinx sounds including a type 1, type 2 and type 3 whistle.

Caterpillar Whistle

The hawk-like call of Mexico's blue-winged Amazon.

Blue - Winged Amazon Parrot Call

This audio recording is a natural threat call of a northern elephant seal followed by four modified signals (pulse rate slowed down by 0.15 Hz and 1 Hz, centroid of the frequency spectrum shifted up by 50 and 200 Hz). Mathevon et al.

Christine Dell'Amore

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