In Starbound, there is only 1 MAIN biome per planet, with tiny biome things in between, so having biome specific mobs is kind of redundant, since each group of creatures is UNIQUE to THAT planet. No other planet will have the exact same mob. The way it works is already similar to pokemon. You catch the creature when it is on low health with a certain item, that creature is then bound to THAT EXACT ITEM. You can carry 3 pets with you to a single planet, and I get the feeling there will be feeding for buffs.