Hardly needs description - everyone who sees one knows what it is - it's a childhood thing!
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This family’s recently acquired canary – which was rescued from the ‘wilds’ of north east England, where it was rapidly failing and no doubt would have soon met its maker - is nibbling on one, in its new cage, as I type (and quickly wearing down what was an over-grown upper mandible).
Lat/Lng: 58.9, -2.9
OS grid ref: HY4812