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What do birds smell? Among the many birds of the world, some are, without doubt, prodigious smellers. Turkey Vultures have a supremely keen sense of smell to lead them upwind from great distances to their malodorous feasts. Gray Catbirds may use their sense of smell to help them on migration. Diminutive seabirds called storm-petrels are olfactory savants - they can detect the scent of prey from a distance of 25 kilometers!