Mysterious Creatures are Lurking Around...

Today as I was making dinner in my kitchen, I heard some strange noises and then I noticed some mysterious creatures in my back yard. They were growling and snarling, and making a mess on my sliding glass door... 

           They kind of freaked me out!          I don't know how to get rid of them! Please help me before they take over my house, oh wait, they already have! I guess I'm stuck with them now.