At 17.45 hours on 20th March 1995, at East Hyde on the River Lea, 3.2 km north of Batford, Hertfordshire, I observed an immature Grey Heron Ardea cinerea perched on a branch of an Alder Alnus glutinosa, the only tree along that stretch of the river. Owing to the closeness of the tree foliage, which extended 2 m out over the water, the heron was in an exaggeratedly hunched stance, its head almost t

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