SciFi/Horror flick with plesiosaur-looking monsters

Sci-Fi/ Horror flick seen on Saturday afternoon in 70s but the movie might be older with plesiosaur-looking monsters (loch Ness monster shape) but only as big as a man and they crawled on belly. There were many, and it seemed like an invasion. One scene a monster drops out of a tree onto a man–possibly in uniform.

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