BTW, crepuscular is typically considered a SUBSET of nocturnal, so when there is not the refinement done that is what papers will say, so you will find both, yes. Also when unable to be active enough at dawn at dusk (Notice those are the times of MOST activity, not ALL activity.) there is a preference for night activity to make up the needs. If that doesn't work they will be active in the day. People here in the U.S. will be more familiar with that same pattern among raccoons which are most active in low light conditions that are hard on our eyes, tend to be active but less so also at night, but if the conditions have been bad -- say storming at night or during a time when food supplies are lower than needed or babies made it impossible for mom to forage for a while -- then they will come out at day to fill their needs. Anyway, crepuscular does *NOT* mean that the animals are strictly only active then; it means that subset of nocturnal activity is when the animals are typically most active. It's a pretty good time, though it has its hazards from other species that also exploit its good points. There are several larger prey species which are slowing down. Some smaller prey species like frogs are announcing themselves so easier to find. The cooling is slowing down some reptiles which can pose dangers such as snakes, the low light conditions are not optimal for multiple birds of prey. You get the idea. Notice that the terms only refer to usual times of most activity. There is flexibility in there when needed and that flexibility is used. Heck, humans are diurnal, but how much do you get done at other times, even without lighting? Sukie (not a vet) Current FHL address: http://groups.yahoo.com/group/ferrethealth Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/fhc/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html [Posted in FML 5545]