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  2. Yawn - Wikipedia

    en.wikipedia.org/wiki/Yawn

    A white tiger yawning A cougar yawning. Mammals, birds, and other vertebrates yawn. [62] In animals, yawning can serve as a warning signal. Charles Darwin's book, The Expression of the Emotions in Man and Animals, mentions that baboons yawn to threaten their enemies, possibly by displaying large canine teeth. [63]

  3. 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 ...

  4. Why you yawn when you’re bored, according to experts - AOL

    www.aol.com/lifestyle/why-yawn-bored-according...

    Yawning is also phylogenetically preserved, meaning it occurs in many different animal species including mammals, birds, reptiles, amphibians, and fish, Epstein adds. Why do I yawn when I’m bored?

  5. Crepuscular animal - Wikipedia

    en.wikipedia.org/wiki/Crepuscular_animal

    In zoology, a crepuscular animal is one that is active primarily during the twilight period, [1] being matutinal, vespertine/vespertinal, or both. This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daytime and of night, respectively.

  6. Why do we yawn — and why is it so contagious? Experts explain.

    www.aol.com/lifestyle/why-yawn-why-contagious...

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  7. Why do dogs yawn so much? - AOL

    www.aol.com/.../02/why-do-dogs-yawn-so-much/24507921

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  8. 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]

  9. Nest-building in primates - Wikipedia

    en.wikipedia.org/wiki/Nest-building_in_primates

    The nests may be 1 to 5 feet (0.30 to 1.52 m) wide in diameter and are constructed by individuals. Young animals nest with their mother but do not construct nests until three years of age, initially in close proximity to their mother. [19] Gorilla nests are distributed randomly and the tree species used appears to be opportunistic. [2]