Ruddy turnstone but it feeds mainly on invertebrates. Insects are particularly important in the breeding season. At other times it also takes crustaceans, molluscs and worms. It often flips over stones and other objects to get at prey items hiding underneath; this behaviour is the origin of the name "turnstone". It usually forages in flocks. They have also been observed preying on the eggs of other bird species such as gulls, terns, ducks, and even other turnstones, though this behaviour is uncommon. In the majority of observed cases, turnstones typically go after undefended or unattended nests, puncturing the shells with their beaks
Tournament sort in Haskell, based on Scheme code by Stepanov and Kershenbaum. Tournament sort Tournament sort is a sorting algorithm. It improves upon the naive selection sort by using a priority queue to find the next element in the sort. In the naive selection sort, it takes O("n") operations to select the next element of "n" elements; in a tournament sort, it takes O(log "n") operations (after building the initial tournament in O("n")). Tournament sort is a variation of heapsort. Tournament replacement selection sorts are used to gather the initial runs for external sorting algorithms. Conceptually, an external file is read and