For bird behaviourists! The House Sparrow (Passer Domesticus) has become a rare bird... except on my garden where, by consequent feeding and provision of clean water for drinking and bathing AND the provision of thick hedges I have built up a flock of probably 40 birds. Why did I make this video? Because constant threats from disease and changing environment mean that this may well be a necessary historic document. It is also action packed.

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