These four seagulls each fly in a somewhat circular pattern, each one's pattern is different from the others and can be changed by you if you know how to use SL's Edit menu. The flying scripts are not modifiable but everything else is. Also, they each have a different unique seagull sound effect.
They have copy permissions, so make as many as you want and each one is individual so you can position the flock however you like.
They flap their wings up and down as they fly as well as they dart up and down somewhat. They have occasional seagull sounds to add to the ambiance of the sea! They don't all have the same sound.
Please note that these seagulls are flat, which keeps the price and the land impact down, however, they look good (not flat) while flying because they are in constant motion so the eye isn't focused on them individually, and they are busy flapping their wings and darting up and down in their flight pattern.
It was hard to get a good picture of them because of the continuous motion.
Permissions = Copy and Modify
Land Impact = 1 LI each
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See item in Second Life