Over water the diurnal change in refraction is likely to be small.
A diurnal animal hunts its food during daylight.
"Rolled round in earth's diurnal course, With rocks, and stones, and trees."
Even if the prey had a good sensory system to notice a predator closing in, the success rate of a nocturnal attack may be higher than a diurnal attack.
The sun sinks, a pair of toucans passes noisily overhead, and the diurnal monkeys begin wandering off, heading back to their nests for the night.
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