Mainly birds sing for two reasons:
1) to defend a territory (somewhere to feed and bring up their young)
2) to attract a mate
some birds sing for both reasons, some for just one. Mainly it’s just the males that sing. Generally speaking the more colourful a bird is the less complicated its song – and the more complicated the song, the less colourful/amazing it looks.
Here’s a short video I took of a corn bunting singing – sorry it’s a bit out of focus!
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