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Tweet of the Day is the voice of birds and our relationship with them, from around the world.

Sir David Attenborough presents the South American hoatzin. Moving clumsily through riverside trees the funky Mohican head crested hoatzin looks like it has been assembled by a committee. Hoatzin's eat large quantities of leaves and fruit, and to cope with this diet have a highly specialised digestive system more like that of cattle, which gives them an alternative name, 'stink-bird'.