Barrier for a cat

    Thanks to their sharp claws cats can freely climb on trees of almost any height.
    While this doesn't disturb us, such a behavior of cats seems even funny.... But not always.
    Sometimes there are situations when you need to prohibit cats from behaving in such a way. How can you do this?
    It's easy. For example, to prevent cats from climbing on trees and killing chicks in the nests bind tin plate on the branch. Such a barrier is the one that cats are not able to overcome (see picture attached).