The future human mothers are not the only ones to have sudden food cravings during pregnancy: even the females of a New Zealand passerine seem to prefer some particular dishes while they hatch. Above all, they seem to have understood very well how to communicate it to the partners, who work in every way to satisfy them.

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spoil yourself properly. Researchers at the Victoria University in Wellington (New Zealand) tested the harmony of 16 pairs of New Zealand wet nurse (Petroica a. Longipes) while the females were brooding. These were fed with worms or insect larvae in two conditions: while the males saw them eating, and with the males distant.

It's the little one who asks for it! The feathered ones prefer the food that they have not touched for the longest time. The males have always been able to recover it, even when they had not seen the contents of the previous meal: the proof that the companions had been able to communicate them not only to be hungry, but also of what. The partners thinned more strongly and in a more insistent way when the partner kept the favorite food in its beak, thus signaling its satisfaction.

This strategy could be common to other bird species, and contribute to the couple's reproductive success: a diet as varied as possible covers the high energy costs of the hatching.