Black-headed gull nesting. Poland 

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Black-headed gulls feed their young by regurgitating it onto the ground, rather than into each chick one at a time.
The rate of parental food regurgitation to chicks increases with begging intensity.
The amount and response of begging signals differs throughout the nestling period. Usually, there is 3-5 begging events/hour, each lasting around one minute. High intensity begging behaviour appears at the end of the first week in the nest, but the coordination between multiple chicks emerge during the last week of the nestling period.
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