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.
Hello may be derived from hullo, which the American Merriam-Webster dictionary describes as a chiefly British variant of hello, and which was originally used as an exclamation to call attention, an expression of surprise, or a greeting. Hullo is found in publications as early as 1803.