Birds and mammals share what characteristics?

Answer:
Birds and mammals both have the following:
  • a backbone and internal skeleton, as they are vertebrates
  • they are warm-blooded
  • they breathe using lungs (not gills)
First answer by Wow12151617181920. Last edit by On the Wallaby. Contributor trust: 2762 [recommend contributor recommended]. Question popularity: 1 [recommend question].