Well this could be an advantage to the insects because the insects can conceal with the color of the sticks. This trait could have evolved the through natural selection because its a chance of staying alive.
An exclamation used as a greeting, to call attention, as an exclamation of surprise, or to encourage one. This variant of Halloo and Holloo has become the dominant form. In the United States, it is the most common greeting used in answering a telephone.
Another source has been suggested to be the phrase Hail, Thou, as used in some translations of the Bible Telephone The word hello has also been credited to Thomas Edison, specifically as a way to greet someone when answering the telephone; according to one source, he expressed his surprise with a misheard Hullo.