Uhh...hi Mr. Cat! Don't eat me because we're related! If you eat me, that would be like you eating a family member!
Meow, you were easy to catch!
Hmmm... how is that possible? You're just a rat and I'm a cat! You're lying to me, I should just eat you already.
No, no, not at all! Look at us, we both have tails, a spine, a hip, and four legs!
Whatever... I'm getting bored
But wait, it really is quite interesting. We have homologous structures despite the fact that we look so different from each other on the outside. This means that if you were to compare our bone structures, you would see that we have the same types of bones in relatively the same positions!
Great story...so intriguing...time to die! Even if we have homologous structures, we are different species. It's this simple: I'm a cat and you're a rat; my family only consists of other cats, NOT RATS!!
(Thinking to self as cat talks) I better run quickly over to that house's deck; I know it has a hot tub.
Haha Mr. Cat!! Since my rat ancestors have always had to deal with annoying, mean cats like you, we have adapted through natural selection! Therefore, we are able to climb up onto tall ledges like this hot tub! You can't get me here!!
Whatever...smart rats don't taste that great anyway.