Other Comparisons: What's the … Who knew a garden could be so much fun. It's fun to watch the drama unfold as the birds are screeching. As nouns the difference between mockingbird and catbird is that mockingbird is a long-tailed american songbird of the mimidae family, noted for its ability to mimic calls of other birds while catbird is either of two species of american mockingbird relatives, the grey catbird,. Two mocking birds like to tease the cat.