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2. List of nocturnal birds - Wikipedia

   en.wikipedia.org/wiki/List_of_nocturnal_birds

   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.

3. List of nocturnal animals - Wikipedia

   en.wikipedia.org/wiki/List_of_nocturnal_animals

   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.

4. Avian sleep - Wikipedia

   en.wikipedia.org/wiki/Avian_Sleep

   In birds, sleep consists of "periods of eye closure interrupted by short periods of eye-opening." [This quote needs a citation] During the short periods of eye-opening, electroencephalographic (EEG) studies indicate that the birds are still sleeping; the voltage level in the brain is identical. [1] Birds restore their arousal thresholds during ...

5. For first time, Scientists find evidence of birds sleeping ...

   www.aol.com/article/2016/08/07/for-first-time...

   A new study shows that frigatebirds can - and do - sleep while flying, though the amount of sleep in the air is much less than on land. For first time, Scientists find evidence of birds sleeping ...

6. Sleep in animals - Wikipedia

   en.wikipedia.org/wiki/Sleep_in_animals

   Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...

7. Nocturnality - Wikipedia

   en.wikipedia.org/wiki/Nocturnality

   The kiwi is a family of nocturnal birds endemic to New Zealand.. While it is difficult to say which came first, nocturnality or diurnality, a hypothesis in evolutionary biology, the nocturnal bottleneck theory, postulates that in the Mesozoic, many ancestors of modern-day mammals evolved nocturnal characteristics in order to avoid contact with the numerous diurnal predators. [3]

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