In the area of the municipality there is a grey heron nesting place and the site of Snake's Head Fritillary. The grey heron colony is located along the road between Biš and Gočovo in Slovenske ulated Pesnica River. The colony nests gorice, on the embankment of the reg- on alder trees in alder wood, which used to be a swamp until the Pesnica River was regulated.

The grey heron colony in Biš has 50 nests. The grey heron is a wading bird. Male and doe reach from 90 to 100 centimetres in height. Their wing span is from 175 to 195 centimetres. In the air, the sight of them is powerful. Grey herons usually nest in colonies near water, in swamps, along fish ponds, lakes, streams and river branches. In the forest there are mainly alder trees with some ash trees and a small share of oak trees. The forest is in its natural state and is e Snake's Head xempt from manage-ment as a forest reserve.