These are beautifully designed Pairs-Memory Games with an extra twist. Instead of simply matching two identical things, there is a challenge of matching a tree species to its corresponding leaf or pairing a male and female bird of the same species. It's tough but rewarding. Great for budding Arborists and Ornithologists, or for anyone who likes to learn about nature. Comes in a lovely cardboard box, and with an informative sheet of facts about all the species depicted on the cards. Not just for kids.