Saw numerous Thorn bugs ( Umbonia crassicornis) on twigs in Costa Rica. These thorn-like bugs discourage birds and other predators from eating it as they consider it is a thorn. When I saw the first few, I thought they were thorns!!
Thorn Bugs – Costa Rica
100CountryTrek.com 
Wow, they really do look like thorns.
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They sure look like thorns.
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That’s what I thought too..finally realized they were bugs.
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