This video, recorded in Australia, says about itself:
This Crab Doesn’t Take Kindly to Home Intruders
23 jan. 2018
The crown-of-thorns starfish eats coral reefs; coral reefs happen to be the home of the guard crab. This puts these two tenacious aquatic creatures on a direct collision course.
From the series: David Attenborough’s Great Barrier Reef
Dear Kitty. Some blog 
Fascinating, Dear Kitty!
A mighty little crab, it would seem!
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Yes, taking on a big adversary!
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