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.
(a word of kindly greeting, as to one whose arrival gives pleasure): Welcome, stranger! noun. 2. a kindly greeting or reception, as to one whose arrival gives pleasure: to give someone a warm welcome. verb (used with object), welcomed, welcoming. 3. to greet the arrival of (a person, guests, etc.) with pleasure or kindly courtesy.