The side of the pest that faces, the wind is made thicker in order to protect the chicks from the cold. However, to prevent them from overheating, their mother will make small gaps in the other side-of the nest, to allow air to flow through.
The side of the pest that faces, the wind is made thicker in order to protect the chicks from the cold. However, to prevent them from overheating, their mother will make small gaps in the other side-of the nest, to allow air to flow through.