A thrips is a tiny insect that can have a not-so-tiny effect on plants. A lot of research is currently carried out on how to get rid of these creatures.
Sexual selection can lead to fascinating phenomena. We are all familiar with the fabulous color display of male peacocks to attract females. Less well known, but definitely not less interesting, are stalk-eyed flies.
It seems that mosquitoes use human body odor to locate suitable hosts, and different people smell differently to mosquitoes.