They’re probably already living in your bushes. Also, they typically don’t smell or bite, and kids should be able to handle them safely. Just put one in a container and give him fresh lettuce every two or three days.
Start with a ready-made ant farm (available at toysrus.com). Every day, put in a drop of water; every two or three days, a few bits of fruit or vegetables. Done.
Don’t let the cartoon crowns fool you: These brine shrimp expect no royal treatment. They eat powdered food weekly, devour algae (no jar cleaning required), and do neat tricks, like swim against a current and, ahem, mate. (Available at toysrus.com.)
Ready for a (slightly) bigger commitment? These low-maintenance pets are just the ticket.