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9 incredibly cute arthropods

By: Mary Jo DiLonardo on April 13, 2016, 8:40 a.m.
happy face spider

Photo: Nate Yuen/Wikimedia Commons

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Happy face spider

To see the smiling grin on Theridion grallator's pale abdomen, you'd have to be on the islands of Oahu, Molokai, Maui and Hawaii. And you'll have to look very hard to spot one of these grinning insects; they're only about one-fifth of an inch long. Scientists believe the happy face spider may have developed its distinctive markings to scare off birds (its only real predator) from eating it, says the Encyclopedia of Life.