乙戸沼 Park accommodates a lot of waterfowls during winter. Interestingly, southern side of the pond is frozen on surface, no life seen floating. Old cherry trees planted along waterside might have grown too much, shut down sunlight to warm water. Northern side is in contrast, quite vigorous full of wild ducks, swans and black-headed gulls. Mt. Tsukuba gently looks at them, not only from sky-high but from the ground.