I don't know for a fact but would expect blackbird poo to be much the same as that of any other bird. The items in the photo's don't look like the produce of any bird I'm familiar with, the exception being owl pellets.
A bit of a strange one for me after staring at the pictures for way too long, can't quite work out what it's been eating, maybe lots of sunflower seeds or berries?
Either way you've got a Hedgehog or an Owl which is great 😃
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Can't see any bones though and they look to be made up of partially digested vegetation.
I really should get out more.
Either way you've got a Hedgehog or an Owl which is great 😃