Southern River Otter (Lontrhttps://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Southern_River_Otter.jpg/440px-Southern_River_Otter.jpga provocax)

The Southern River Otter inhabits the rivers, lakes, and coastal marine habitats in Chile and Argentina. They have an elongated body reaching up to 3.8 feet and 22 pounds. 

Their diet is varied, from fish to crustaceans and mollusks. However, they also prey on small birds and mammals when the opportunity arises.

Daisensui pond of Koishikawa Korakuen Garden

The pond in the center of the garden is the Daisensui. Inspired by Lake Biwa in Shiga Prefecture, the pond plays the role of the main attraction in the gardens. The man-made island, named Horai-jima, and the rocks in the pond coordinate well with the surrounding atmosphere to create graceful scenery. In its earlier days, the pond was used for sailing as well.