What are the similarities and differences between the bat, bird, and insect?

What are the similarities and differences between the bat, bird, and insect?  

The bat is a mammal, whereas the bird and insect are not mammals. 

The bat and bird have two legs, whereas the insect has six legs.

The bat, and many species of birds and insects can fly. The bat is the only mammal that can fly. 

The bat, bird, and insect fly in different ways.

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