Apparently, in the world of fiddler crabs, size does matter, both in terms of the male himself and his abode.
"The size of a male's burrow affects the development time of his larvae," said Catherine deRivera of the University of California, US.
"A burrow of just the right size allows larvae to hatch at the safest time, the peak outward night time flow of the bi-weekly tidal cycle." http://news.bbc.co.uk/1/hi/sci/tech/4748553.stmSome background to the article ---
Darwin first came up with the concept of "female choice" to explain things in nature like the tail of the peacock. Although biologists accepted many of Darwin's theories -- female choice was forgotten until about 20 or 30 years ago when it was rediscovered. Since then, mate selection, has been a hot research topic for Animal Behaviorists.