Jizz or giss is the overall impression or appearance of a bird garnered from such features as shape, posture, flying style or other habitual movements, size and colouration combined with voice, habitat and location. The concept was popularised in birdwatching, but is so useful that it has since been adopted increasingly widely by field biologists in referring to the impression of the general characteristics of other animals. It similarly appears in such fields of observational biology as microscopy. Ecologists and botanists may speak of "habitat jizz" or the jizz of a plant.
