If the proportion of intact OR genes is an indicator of olfactory ability, one would expect nocturnal birds with good olfactory abilities to encode a higher proportion of intact OR genes than related, but diurnal species.
In general, as expected for nocturnal rodents, all animals were more active during the dark phase than during the light phase, but compared to the other two lines, HR mice showed a marked increase in activity towards the end of the light phase, i.e. some hours before the light-dark transition.
As was expected for nocturnal animals, the activity of mice was considerably higher during the scotophase than during the photophase.
As expected for nocturnal animals, all mouse strains exhibited the vast majority of their wheel-running activity during the dark phase.
Mice (n = 5) showed robust entrainment to the light dark cycle, sleeping mainly during the day and staying awake most of the night, as expected for nocturnal animals.
He was polydispic and polyuric, as expected, and had nocturnal enuresis, precluding precise quantitation of his urine output.
Horizontal advection flux of CO2 was not directly measured in this study; however, an expected exponential relationship between nocturnal ecosystem respiration (RE) and air temperature was recovered when horizontal advection of CO2 was assumed to be negatively correlated to vertical advection, or when data were limited to periods when measured vertical advection fluxes were small.
Paradoxically, in the nocturnal and flightless Kiwi (Apterygidae), the eyes are exceptionally small with respect to body mass [12], rather than large as would be expected because of their nocturnal and flightless habits.
Since mice are nocturnal, it is expected that they will make extensive use of olfactory as opposed to visual cues.
Nocturnal species are expected to have larger LD (~optical aperture) for a given ED (~retina diameter) than diurnal species.
