In what season do walruses appear on famine beaches?

Walrus houses appear randomly, but they are regular. As far as I know, walrus houses (an igloo in winter and a big pit in summer) usually appear at the junction of grassland (plain) and forest, or inside grassland (must be grassland), which is generally deep, with marble columns and several clockwork knights, leaders and chariots, or the base of a conveyor (. Other places are not excluded, but a map has a great chance to show walrus houses in the above places. If you don't understand, please ask questions and seek adoption!