What is the reason why ducklings always piled up like mountains the other day?

Ducks often get together when brooding, mainly because the temperature of brooding is too low. In order to keep warm, ducklings pile up with each other, and the piled ducklings are easy to be crushed, suffocated and dehydrated. When the ducklings are found to gather together, the breeder should take measures quickly to increase the temperature of the ducklings' living area in the brooding room so as not to cause greater losses. After the temperature rises, if the ducklings stay away from the heater, evacuate around the heater, open their mouths to catch their breath, fidget, spread their wings and drink more water, which means that the temperature rises too high and needs to be readjusted until the temperature is suitable. When the brooding temperature is suitable, the ducklings are evenly distributed in all parts of the duck house, spread out and stretch their prone position, and stay still after eating.