Abstract
Bird nets n only reliable method to prevent crop damage from bird. However, the effective mesh size of bird nets is not known for Eurasian Tree Sparrow Passer montanus. We set the feeding station inside the 1m-cube flame with examination nets, and examined the different sizes of net that birds could go through in an aviary. The birds were able to go through 31.8×31.7 mm and 21.9×21.9 mm mesh sizes of the bird nets, and 41.1×26.6 mm of the wire net. On the other hand, they were not able to go through 24.5×18.1 mm of the animal net, 19.8×17.7 mm of the conwed net, 19.4×19.4 mm of the bird net and 26.2×19.9 mm of the wire net. Besides going through the net, the birds could enter by digging on the ground. Setting nets with the appropriate mesh size and countermeasures for digging are important to reduce damage.
