changes in animal behavior

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I like to share what I notice in this few years. I notice animals behavior is changing especially cats. I notice it when my cat and the cats around me do that in past few years. My cat now don't dig hole when the cat want dispose. At first I think it was just my cat. My cat behave like dog. The cat just throws where ever it like. The cat is female cat. I notice now there are many cats doing that and not only my cat. I notice my cat doing that after watching my dog does that. I heard they old saying says, cat dig hole because they don't want tiger to catch them and they are hiding from their enemy tiger. Do you notice that animals behavior is changing? Does your cat do that? What you think the reasons will be? Are the cats lazy to dig hole or the cats don't fear tiger anymore or there is other reasons for doing that?