ricardo guta is studying agriculture.but his professor's enthusiasm is contagious, and now he'd like to study coleopterology in the u.s. >> another interesting thing about this group of grasshoppers -- first of all, they are always very colorful. >> after nightfall is when insects come into their own. professor naskrecki has set up a light trap, based on the principle that moonlight influences insect behaviour. believing the artifical light is the moon, the insects begin to spiral so that they remain parallel to the light source. >> it is insects who actually run the world. they are some of the most important elements of almost any terrestrial ecosystem. they provide a number of services without which we would be unable to function. for instance, pollination. without these moths, all the trees and plants around us wouldn't be able to produce fruit. >> the people who live near the national park have other concerns. but the next day, we get to see how they're starting to benefit from the protected area. locals used to live