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.
Well, here's a surprise from Ammon Shea, author of The First Telephone Book: Hello is a new word. The Oxford English Dictionary says the first published use of hello goes back only to 1827. And it wasn't mainly a greeting back then.