The way parents allocate food among the nestlings in a brood has been the subject of several studies in recent years. Previous works have shown that parents sometimes decide who is going to receive the food according to food availability, nestlings' begging behavior, or the position of a chick in the nest. In this work, we studied the characteristics of the nestling that receives food first in nests with and without experimental food reinforcement in the Creamy-bellied Thrush (Turdus amaurochalinus). Every time parents arrived at the nest, we recorded which of the nestlings received food and its characteristics related to its siblings: size, position, and begging intensity. We found that food allocation was not explained by treatment, size, age, or position of nestlings. Our results also showed that there were no differences in nestling survival among control and experimental nests. However, parents preferentially fed the chick that demanded food first and raised its head higher than its siblings.

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