With the United States containing so many world-Â­famous tourist destinations and being home to three giants of the aviation industry (US Airlines, American Airways, and Delta Air Lines), it's no surprise that the country's airports rank among the busiest in the world, weaving a complex network of routes all over the globe.
Birds, bats and other animals can be used as one of mosquito control methods, but alone they certainly wonât make a visible impact on the population of mosquitoes. Some species of birds like purple martin eat mosquitoes and these insects take few percent of their daily meal and bats, who are night hunters also feed from mosquitoes.
Sea otters, sunflower stars and California sheephead prey on purple sea urchins. Sea otter predation on purple sea urchins helps protect kelp forests from destruction. Sea otters that regularly eat purple sea urchins are easily detectedâtheir bones and teeth turn sea-urchin purple! In the intertidal zone, purple sea urchins decorate themselves with shells, rocks and pieces of algae. Scientists think this behavior protects urchins from drying out, getting eaten by gulls or being damaged by the sun's ultraviolet rays. When a sea star strives to get near an urchin, the urchin moves its spines aside and lets the sea star's arm get really close. Then the ...