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  2. Yawn - Wikipedia

    en.wikipedia.org/wiki/Yawn

    Almost all vertebrate animals, including mammals, birds, reptiles, amphibians, and even fish, experience yawning. The study of yawning is called chasmology. [5] [6] [7] Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. [8]

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

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

    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?

  4. 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 ...

  5. Comfort behaviour in animals - Wikipedia

    en.wikipedia.org/wiki/Comfort_behaviour_in_animals

    Dust bathing mountain zebra in Namibia. Comfort behaviours in animals are activities that help maintain the pelage, feathers, integuement or musculoskeletal system and increase the physical comfort of the animal.

  6. The meaning behind your dog's yawn revealed - AOL

    www.aol.com/article/2016/06/06/the-meaning...

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

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  8. Here’s Why Yawning Is Contagious - AOL

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

    The post Here’s Why Yawning Is Contagious appeared first on Reader's Digest. But why is yawning contagious? Turns out, humans aren't the only animals with a case of the big yawns.

  9. 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]