Storm petrel

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Storm petrel or stormy petrel 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) are found in the Northern Hemisphere, although some species around the Equator dip into the south.

• Southern storm petrels (Oceanitidae) are found in all oceans, although only white-faced storm petrel (breeding in the North Atlantic, in addition to the Southern Ocean) and Wilson's storm petrels (on migration) are found in the Northern Hemisphere.