Why is the stone-curlew so called?

Because, when hatched, the young run immediately from the egg, like partridges, etc.; and are withdrawn to some flinty field by the dam, where they skulk among the stones, which are their best security; for their feathers are so exactly the colour of our grey spotted flints, that the most exact observer, unless he catches the eye of the young bird, may be eluded. - G. White.