The prefix delo- has the sense of “obvious”, and so delotropy and delophany respectively denote obvious behaviour and obvious sounds.
The Origin and Definition of Biological Concepts
A Multilingual Database
The prefix delo- has the sense of “obvious”, and so delotropy and delophany respectively denote obvious behaviour and obvious sounds.
Armstrong, E.A. (1949). Diversionary display, part 1. Connotation and terminology. Ibis 91, 88-97: 97.