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Laughter in animals other than humans describes animal behavior which resembles human laughter. Several non-human species demonstrate vocalizations that sound similar to human laughter. A significant proportion of these species are mammals, which suggests that the neurological functions occurred early in the process of mammalian evolution. [ 1 ]
While any dog can smile, some breeds are genetically predisposed to do it more than others, according to veterinary behavior specialist Dr. Lore Haug. These breeds include Doberman Pinschers ...
No two dogs or dog owners are the same, but at the end of the day, we all want the same thing: to see our dogs happy. Those wagging tails and playful howls can put a smile on any dog lover's face ...
Dolphins can "smile" as well. When playing, they exhibit similar facial expressions to that of a smile. Researchers call it "open mouth display" which they only exhibit when socializing and ...
A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses delight, sociability, happiness, joy, or amusement.
The belief in the evolutionary basis of these kinds of facial expressions can be traced back to Darwin's The Expression of the Emotions in Man and Animals. Reviews of the universality hypothesis have been both supportive [22] [23] and critical. [24] [25] Work in 2013 by Nelson and Russell [26] and Jack et al. [27] has been especially critical.
Image credits: jjky665678 It turns out that cats have their own analogue of a smile - they simply blink slowly when they look at their owners. And scientists who have studied thousands of cat ...
Theridion grallator, also known as the Hawaiian happy-face spider, is a spider in the family Theridiidae that resides on the Hawaiian Islands. T. grallator gets its vernacular name of "Hawaiian happy-face spider" from the unique patterns superimposed on its abdomen, specifically those that resemble a smiley face. [2]