Brand new on the market are a couple 7" field monitor/recorders. Haven't seen them in action yet, but for daytime viewing, these little guys should be great and they record HDMI in up to 4K resolution. Use it on your bird, then take it off and you have a professional monitor to slap on your conventional camera.
Atomos Ninja Flame 7" 4K HDMI Recording Monitor ATOMNJAFL1
Atomos Ninja Flame 7" 4K HDMI Recording Monitor ATOMNJAFL1