Any idea what killed this pheasant?

[cashmax]

Really strange, it had been feeding with the male and later came out of the bushes like it had been attacked, died very quickly. Not a mark on it that I could see?

https://youtu.be/C6JHeubX1y8

[Landlubber]

Anyone around with an airgun.

[cashmax]

Landlubber said:

Anyone around with an airgun.

Nope - The only thing around was a guilty looking grey squirrel.

[Resolutionary]

Contaminent / poison or asphyxiation - they're not that bright bless 'em.

[Crossbill]

The way it’s rolling around looks like it’s being attacked by a stoat or weasel, although I can’t actually make one out on the footage.

[gotoPzero]

Adder bite maybe?