A hummingbird, or a water vole are smaller animals and are always bustling around a lot. They breathe faster and their physiology is geared towards a frantic life.

Whereas an elephant, or a Greenland Right Whale, move much more slowly and have a far greater life expectancy than, say, a field mouse. Being a larger animal seems to bring a longer natural lifespan.

Granted, lots of field mice tend to get swallowed up by combine harvesters and chewed up, unlike Greenland Right Whales. There is a farm next door to me, so I did a bit of research and Paul (the farmer, not the field mouse) told me that in 30 years of farming he hasn't never found a wild elephant or blue whale in his combine harvester.

The converse of that - and this is crucial - is that Khosai Galaxy for instance has never been pursued by 18th century whaling schooners, and I recall that in the 1980's George Foreman has the devil's own time shaking them off. They were just after him all the time. Relentless.

In summary, therefore, a Fighters prime may change depending on the weight class, but that all hinges on whether they are anywhere near combine harvesters or 18th century whalers.

That is all.