Storm petrel

Storm petrel or storm petrels may refer to one of two bird families, both in the order Procellariiformes, once treated as the same family.

The two families are:
 * Northern storm-petrels (Hydrobatidae), found in the northern hemisphere although some species around the equator dip into the south


 * Austral storm-petrels (Oceanitidae) are found in all oceans, although only the white-faced storm petrels (breeding in the North Atlantic, in addition to the Southern Ocean) and Wilson's storm-petrels (on migration) are found in the northern hemisphere