The writer needs to get some education but I guess common sense ain't common anymore.
Two female dolphins can't reproduce. Basic biology: female dolphin and male dolphin go through a mating process then the female reproduce one calf.
Two Roosters can't reproduce.
You put a rooster with a hen, they go through the mating process which is called “Cloacal Kiss". Then the hen (not the rooster), will lay fertilized eggs and chicks hatch from eggs.
The most important thing is They are polygamous or polyamorous! To solve the modern day first world problem, the discrimination against polyamory family. TOTS show suppose to be promoting polyamory AKA orgy, Disney you got it wrong.
The song should be
"All you need to make a family, Is orgy, poly-amory"
"When you f--k together with your family"