Yīngxiāo de jiàoshēng shì liǎng shēng yī zǔ de shàoyīn.
The brown hawk-owl's call is a two-note whistle.
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Literal: 鹰 (hawk) + 鸮 (owl) — named for its unusually hawk-like silhouette among owls. No prominent facial disc, long tail, pointed wings: it looks more like a small hawk than an owl.