It's absolutely a shame that "Creatures" is the absolute least SEO-friendly name for a game series ever, because Creatures (90's pc game series) is a really interesting animal... and one I know very little about, compared to Petz.
There's so many fascinating quirks to the official breeds! Like C2's Frog Norns:
The Frog Norns came as part of Life Kit 2 for Creatures 2, and were the second official norn breed released for the game (the Golden Desert Norns were the first). They only come with adult sprites, and unlike most breeds, which are hatched from eggs in the hatchery, they are injected into the world as frogs that live in the underground lake by the Dark Ocean. On being kissed by a Norn, however, the frog is transformed into a frog norn of the opposite sex. Frog norns are amphibious, but they cannot stray too far from their pool or they will revert to frogs and die. Any child of two Frog Norns (a second generation Frog Norn) can move anywhere in Albia, without restriction, and will never revert to frog form.
But Creatures 3 sounds like it has a lot of... idiosyncratic breeds. Some of them were given specific "care guide" manuals on the official website, to take into account the way that they different from typical norns.
- Hardman Norns: resilient, aggressive Norns that can fend off attacks from Grendels on their own. They consider the predator-laden and toxic Jungle Terrarium, not the peaceful Norn Terrarium, the best place to lay eggs and raise their young.
- Treehugger Norns: about as opposite to Hardman Norns as possible, they're physically frailer and more prone to getting sick, as they came from an Eden-like environment without predators or other hazards. They also need to supplement their diet with raw plant material in order to put on body fat, as they can't absorb fat from ordinary Norn foods.
- Bondi Norns: laid-back Norns from a coastal environment, that age slower and live longer than other Norn breeds. Can survive in water without drowning for a bit longer (though they aren't amphibious), are omnivores that can eat live prey, and are happy to lay eggs in any enviroment available.
- Toxic Norns: The real fucking weirdos. Need to be awash in detritus, toxins and diseases to stay healthy, and get sick if you feed them antibiotics. Potentially dangerous to hybridize with other Norn breeds, as the result is likely to have an immune system at constant war with itself.
Other Creatures 3 breeds that are less radically different in biology from the norm include:
... and the Magma Norn apparently has temperature-related preferences, but there's no official care guide for it.