Gourami are unsuitable for the general hobbyist. Generally regarded as peaceful, gouramis are still capable of harassing or killing smaller or long-finned fish. Depending on the species, adult and juvenile males have been known to spar with one another. Aggression can also occur as a result of overcrowding. Gouramis have been housed with many species, such as danios, mollies, silver dollars, Neon tetras, and plecostomus catfish. Compatibility depends on the species of gourami and the fish it is housed with. Some species (e.g. "Macropodus" or "Belontia") are highly aggressive or predatory and may harass or kill smaller or less aggressive fish;
Creature type (Dungeons & Dragons) animals despite their real-world bases being more closely related to vermin type creatures. Creatures deemed inconsequential by DMs or designers are not given any creature type at all, instead being treated as "set dressing" unless a specific game effect targets such non-creatures. Examples include actual-sized spiders, sparrows, fleas, worms, shellfish, and mice. "Swarm" type creatures are occasionally written to represent such otherwise nonthreatening creatures if they were to group together by some force of magic within the game world. Under the rules of D&D, animal type creatures do not have an Intelligence score higher than 2. When a designer makes