1 Corinthians 15:42 So will it be with the resurrection of the dead. The body that is sown is perishable, it is raised imperishable;
Every living being on earth is different. We are different to animals. We are different to fish and birds.
And then, when we die in our physical bodies, we are raised up in our spiritual bodies – very different again!
Our physical bodies all have a limited lifespan no matter what we are: fish, bird, animal or mammal; but our spiritual bodies are eternal!