Leafcutter ants
a non-generic name, are any of 47 species of leaf-chewing ants belonging to the two generaAtta and Acromyrmex. These species of tropical, fungus-growing ants are all endemic to South, Central America, Mexico and parts of the southern United States.
Next to humans, leafcutter ants form the largest and most complex animal societies on Earth. In a few years, the central mound of their underground nests can grow to more than 30 metres (98 ft) across, with smaller, radiating mounds extending out to a radius of 80 metres (260 ft), taking up 30 to 600 square metres (320 to 6,500 sq ft) and containing eight million individuals.
Scallops have up to 100 simple eyes strung around the edges of their mantles like a string of beads. They are reflector eyes, about one mm in diameter, with a retina that is more complex than those of other bivalves. Their eyes contain two retina types, one responding to light and the other to abrupt darkness, such as the shadow of a nearby predator. They cannot resolve shapes, but can detect changing patterns of light and motion.