A Yawn not a Squawk

I sometimes throw some scraps out on my flat roof and have attracted a little gang of seagulls who sometimes circle around either first thing in the morning or mid afternoon to remind me noisily that they would like some food.  Today I threw one slice of bread but I was still out on my deck with Ginny for a short while and "lookout" gull got really bored waiting for us to go in before he would swoop and claim it.  He made not a sound but this was the full extent of his beak wide open in a bored yawn.
I'm getting in to this bird photography!