Within city limits

I often head out into the rural areas outside of town in search of good nature and wildlife opportunities. Lately it seems I don't even have to leave my own back yard.
While outside BBQing a few weeks back I couldn't believe my luck when I noticed a bald eagle circling above my house while being chased by angry seagulls. I'm assuming the gulls are nesting nearby and the eagle has found it to be a chance for a quick meal.
I really wouldn't mind a 400mm f/2.8 for shots like this; problem is I don't have $9,000 to spend on fast glass. My 270 was barely able to capture this sequence from a distance of approx 200' up.