Birds will eat anything that we think is sweet.
You may need to cover them with some netting when it's almost harvest time; maybe even before that. I have a couple of red currant bushes and the first year, I didn't get anything.
We have also had an old cherry tree at another property and we hung netting and also hung CD disks (didn't help too much) so the birds would get distracted. We still had a great harvest despite the mess of half eaten fruit on both the tree and the ground.