Does anybody know what birds feather this is?

Does anybody know what the two brownish/black feathers on the far left and far right are?

We found these on a walk through Knole Park and are pretty sure we have identified the two in the middle. The blue/green feather belongs to a parakeet and we believe the large stripey one belongs to a tawny owl!! 

We have searched so much to find what these feathers belong to but have had no luck.

Hopefully someone could help us!