Is it just me or do those gallons look a little puffy

Yes, it's actually a pretty standard avenue toward speciation, aka the recognition of a new species https://en.wikipedia.org/wiki/Hybrid_speciation

It's more common in plants but it happens in animals as well. Hybrid animals actually can sometimes reproduce (that's how they can become a new species, after all), depending on the genetic qualities of the parents. Ligers (lion-tigers) are fertile and can mate with other ligers, tigers, or lions. The well-known example of the sterile mule is due to the fact that horses and donkeys donate 32 and 31 chromosomes to their offspring, respectively, so the child of a donkey-horse pairing (a mule) will have an odd number of chromosomes, leaving them unable to reproduce.