“These data describe the daytime habits of two species of lizards, grahami and opalinus.
They were collected by observing occupied sites or perches and recording the appropriate description, namely
species involved, time of the day, height and diameter of the perch and whether the site was sunny or shaded.
Time of the day is recorded as early, mid-day or late.” (McCullagh and Nelder, 1989, p.129).