Did you ever wonder what fish do in the ocean, when they aren't swimming around in search of food or mates? Try marine architecture.
The red grouper species, better known as a tasty food source, has been caught digging holes in the ocean beds, which can form the basis of thriving oceanic communities that harbor a variety of other species, as well. From the Washington Post:
"But their least-known attribute might be the most valuable of all: They operate as underwater architects, transforming the seascape for myriad other forms of underwater life, rather than just residing there. That surprising discovery is forcing scientists and policymakers to recalibrate their approach to preserving the ocean's natural order -- and heightening tensions with those who fish for a living or as a hobby."
Predictably enough, the comments from readers on the above article range from 'what a wonderful world we live in' to 'you'll get my fish when you pry it out of my cold dead hands' attitudes, from nature-worshipping to dominionistic outrage.
So, "Why did the fish dig a hole?"
To provide himself with a home, of course.