Explain why the birdblock (spruce bough and pine bough) flies to the forests of the taiga zone for the winter and here

Explain why the birdblock (spruce bough and pine bough) flies to the forests of the taiga zone for the winter and here (at the end of January – February) hatches chicks.

Since the crossbills feed almost predominantly on coniferous seeds, which are not harvested every year, annual fluctuations can be observed in the seasonal phenomena of these birds.
At any time of the year, crossbills make relocations, leaving areas with poor cone harvests and accumulating in large numbers in fertile areas of coniferous forests.
They hatch chicks when there is a lot of food around. Most often, they start breeding in late winter and early spring, when there is deep snow and there are severe frosts. This time coincides with the greatest abundance of spruce and pine seeds.

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