Tier

The longer any of the breedables remain rezzed and active, the more it does whatever it happens to do, and the higher its tier becomes.  Higher-tiers work more productively (scare away spiders faster, heal better, etc).  A high-tier king/queen/prince/princess can dramatically affect the production and consumption speeds of your pets. All the breedables DO all have a maximum potential age, but even after reaching that point they simply become pretty cosmetic toys.  They no longer do their jobs or eat, but they continue fluttering around and filling your garden with color.  Most of them will live at least half a year, and can survive upwards of a year and more, particularly when combined with longevity pools. A higher tier will make it more valuable, you’re more likely to get a better mutation from a Tier 6 flutter than a Tier 1. A Tier 6 has had a chance to gain mutation points and other stuff.