The Mammal Association is asking nature lovers this weekend to count bats in their garden. That is best done around ten o'clock in the evening, according to the organization.

The Year-round Garden Counting organization is best known for the butterfly and bird counting that takes place twice a year. In addition, nature lovers can also peat bats twice a year.

"To see bats, it is best to sit in the garden for an hour from sunset. That is on May 23 and 24 from about 9:35 pm", advises . "To be able to see the silhouette of a flying bat, look for a place from which you have a clear view of a piece of evening sky. Preferably also with a view of a tree or some bushes, because bats like to fly there."

The organization has published a search map from which people can determine which bat species they have spotted. For example, the common pipistrelle bat lives in cavity walls and under roof tiles and the common bat-eared bat opts for quiet old attics and hollow trees. The water bat also chooses tree hollows, but can also be seen above the water surface of, for example, a pond.

Garden counters are asked to submit their score on the website of the organization. A year ago, the counter ended after 1900 on two evenings.