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En este libro se analiza cmo reparten el alimento entre los pollos el alzacola, la urraca y el gorrin comn. En las tres especies, los padres cebaron preferentemente a los pollos que solicitaron alimento ms cerca de ellos y con mayor intensidad. Existe, por tanto, una relacin entre el comportamiento de los pollos y la forma en que los padres reparten el alimento dentro de la nidada. En el alzacola, cuanto ms hambrientos estaban los pollos mayor fue su intensidad de peticin, y los pollos saciados disminuyeron su intensidad de peticin y la proximidad a los padres. Esto sugiere que estos comportamientos son indicadores de la necesidad de los pollos, y explica por qu los padres responden a estos comportamientos en la forma observada. No obstante, hubo diferencias entre especies en la importancia del tamao de los pollos como factor en las normas de reparto del alimento: En el alzacola y el gorrin todos los pollos fueron tratados igualmente, mientras que en la urraca los pollos ms grandes consiguieron ms alimento.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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