great blue heron families: upstairs and downstairs

In the rookery tree, you can see two of the nests. The upper nest has 4 chicks waiting for the arrival of a parent and their breakfast; their interest is glued to the nest below them. The lower nest has a parent that is feeding its 4 young by regurgitating fish and letting the chicks grab its bill and a mouthful of food. Eventually the 4 downstairs chicks are fed and the family sets about grooming and exploring.
I have to wonder two things: with all the sharp bills, how are injuries avoided and how do 5 large birds not fall off the edge of the small nest. The bills and nest must work: we thankfully still have lots of the fascinating herons around to amaze us.

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