Mites are tiny critters related to spiders and ticks. Because they are typically no larger than a grain of salt, many mite species rely on larger animals to survive. In the neotropics, hummingbird flower mites freeload off an existing partnership. This group of mites feeds on nectar and pollen, but only from specific types of flowers. These picky eaters need reliable transport between blooms that may be yards apart. Without wheels — or wings — of their own, these mites catch a ride in the nostri