Ecosystem is a card-drafting game in which players choose cards and place them into their play area turn by turn. The cards in a player's grid make up their own personal ecosystem, and at game's end, a player will have twenty cards in their ecosystem, with the game including eleven types of cards. Bears score by being placed next to bees and trout; trout score by being placed next to streams and dragonflies; and streams are compared at the end of the game, with the player who has the largest stream earning points. These are just a few examples of how scoring works in Ecosystem. Don't forget to diversify!

—description from the designer