In my community,there have hang a cage,I can't sure whether or not this is a catch flies cage? if it is do,i can't understand its work principle?why have 2 layer cage?
have anybody can tell me?
This is a cage to Catch bug ，the cage have 2 layer，when a bug fly into the inner cage by the below hole, maybe we can put something to the bowl to toll bug， and fly with inner taper to the outer cage by the above hole of inner cage, if a bug into the outer cage, he want to escape is difficult。0915
No comments:
Post a Comment