His research group was studying how the beetles used the polarized light patterns of the moon to stay on their paths, when one moonless night they made a surprising observation the beetles maintained straight trajectories.
At 3.4, the apparent magnitude of the Andromeda Galaxy is one of the brightest of any Messier objects, making it visible to the naked eye on moonless nights even when viewed from areas with moderate light pollution.
On moonless nights, they chase the weather, looking for clear skies at national parks.
On moonless nights, the beetles started wandering all over.
This can be seen up to 50 metres away, especially on moonless nights.
On moonless nights, clupeid schools can be attracted to beams from strong lights and congregate near the surface a behavioral pattern often exploited by fishermen.
How they manage this, even on moonless nights when obvious cues and landmarks are absent or invisible, has been a mystery.
So Dr. Osborn began studying why some elephants -- even at the height of the rainy season when there is plenty to eat -- leave forests and grasslands on moonless nights and pad silently into farms.
(Only shells larger than a thumbnail -- 20 years and older -- are allowed. It takes two summers for an adequate harvest because the kupee emerge from their sandy depths only on moonless nights).
Replacing the lantern candles that private householders had formerly been required to erect outside their front doors, most European civic authorities deployed oil lanterns, maintained at public expense, to light the streets on moonless nights.
