You know, Jonathan Livingstone is a male seagull. Jonathan, in anglosaxon countries, is a male's name. Richard Bach refer to him several times on his book as "he", or "him"... So you, ladies who can read this, don't seek "los tres piés al gato". It's as simple as this, right?

Jonathan's behaviour is the one of a young male not accepting his roll in his life... He had discovered the flight, not as a mean to get food, but by itself. The plane was he himself, and he wanted to know what nowadays is known as the "plane full flight envelop"

Richard says about him:

"Most gulls don't bother to learn more  than  the  simplest  facts  of
flight - how to get from shore to food and back again. For most gulls,  it
is not flying that matters, but eating. For this gull, though, it was  not
eating that mattered,  but  flight.  More  than  anything  else.  Jonathan
Livingston Seagull loved to fly."
Richard Bach - Jonathan Livingstone Seagull