The Jesus bird returns

The New Zealand storm petrel flutters along the surface of the water like a big butterfly, slapping the water with its feet – a habit that has earned all storm petrels the nickname "Jesus birds".

It doesn't follow boats. It is quiet and lives almost its whole life at sea, landing only to breed, and then only at night. It looks a lot like one of the world's most common seabirds, Wilson's storm petrel. All of which explains, perhaps, how for more than 150 years, it did not officially exist.