Male Stickleback Defends its Nest | Bob Armstrong's Nature Alaska

Male Stickleback Defends its Nest shows an anadromous Three-spine Stickleback defending its nest from a Staghorn Sculpin.
This video was taken in an intertidal slough in Juneau, Alaska on July 7, 2018.
The stickleback was fanning the nest to provide circulation to the incubating eggs when this sculpin arrived.
It is interesting to see such a tiny fish attack the very large sculpin and eventually drive it away.
Of interest is the sculpin tried to eat the stickleback at least two times but he escaped.