These two fledgling American Robbins went at it over a perch with plenty of room. Possibly it was the heat that frayed there nerves.
Comments and suggestions welcome,
Morris

1) Standing alone enjoying the cool breeze over the stream on a hot day
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

2) It's sibling drops in from above and the action is wild
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

3)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

4)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

5)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

6)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

7)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

8)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

9)
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV

10) The invader takes over the perch. Did you notice the lady bug was there the whole time?
X-H2S NIKON AF-S NIKKOR 500mm f/5.6E PF ED VR lens 500mm f/5.6 1/320s 1600 ISO +1.0 EV