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Lendrum discovered that the birds in the calm environment spent substantially more time with their eyes closed than those in the aggressive environment. [2] Lendrum collected data on the doves' opened- and closed-eye sleep; flocking was associated with an increase in a bird's overall eye-closure time and a decrease in its amount of eye-opening. [2]
Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night. Matutinal, a classification of organisms that are only or primarily active in the pre-dawn hours or early morning.
Along the center, the image is divided into complementary black (right) and white (left), or, as the title suggests, day and night. The birds of the image contradict the overall partition of black and white throughout the image, as the black birds are in the white part of the image, while the white birds are in the black part, each of them ...
Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night. Matutinal, a classification of organisms that are only or primarily active in the pre-dawn hours or early night.
Sky and Water I is a woodcut print by the Dutch artist M. C. Escher first printed in June 1938. The basis of this print is a regular division of the plane consisting of birds and fish . Both prints have the horizontal series of these elements —fitting into each other like the pieces of a jigsaw puzzle —in the middle, transitional portion of ...
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Paranal Observatory nights. [3] The concept of noctcaelador tackles the aesthetic perception of the night sky. [4]Depending on local sky cloud cover, pollution, humidity, and light pollution levels, the stars visible to the unaided naked eye appear as hundreds, thousands or tens of thousands of white pinpoints of light in an otherwise near black sky together with some faint nebulae or clouds ...