Answer:
Fish
Have scales, live in the water, are cold blooded, have a diet of smaller organisms or algae, depending on the species, have a different life span, have a different body type, and can swim.
Birds
Have feathers, live in trees and forests (most, some like penguins don't), are warm-blooded, have a diet of insects and grain or fish (depending on the species), have a different life span, have a different body type, and can fly (most can, some swim, some walk).
Fish Attributes / Bird Attributes
Cold-blooded / Warm-blooded
Most swim underwater / Most fly in the air
They have scales and fins / Most have wings with feathers
They can breathe underwater / They have lungs