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.
greeting; salutation. Hypernyms (greeting is a kind of...): acknowledgement; acknowledgment (a statement acknowledging something or someone) Domain usage: plural; plural form (the form of a word that is used to denote more than one) Hyponyms (each of the following is a kind of greeting): well-wishing (an expression of good will from one person to another) military greeting; salute (a formal military gesture of respect) afternoon; good afternoon; good morning; morning (a conventional expression of greeting or farewell)