During the summer cold snap, swifts abandon their nests and move south, sometimes hundreds of kilometers.

During the summer cold snap, swifts abandon their nests and move south, sometimes hundreds of kilometers. Chicks fall into a daze and are able to stay in this state, without food, for several days. When it gets warmer, the parents return. Explain what caused the migrations.

with a cold snap, the number of flying insects that swifts feed on sharply decreases. The numbness of swift chicks is an adaptation to life in northern countries, where summer cooling is observed quite often.