When the weather is good, one can observe nocturnal insects like moths or certain beetles cruising around a source of light. The insects are actually attracted to light because they become completely confused by it. The only light that the animals naturally experience is the moon which does not markedly change its position relative to the insect due to the far distance. This is different with an artificial light source that changes its position in relation to an approaching insect. The insect tries to correct the change of position and as a result it approaches the source of light spiral-like. This behaviour can be used to attract to and catch nocturnal insects in a light trap for instance in order to determine moth diversity or distribution. The device consists of a light reflecting screen or cylindrical gauze and a black light fluorescent tubes which emits a certain ultraviolet light that moths readily respond to.
We visit fluorescent tubes attached to the outside of buildings late at night or early in the morning and we encounter different moth species, provided that the weather is good and there is new moon. Additionally we provide some over ripe fruits that is a very effective bait for certain moths. What kind of insects can we encounter?
