Yes, eagles are definitely a problem. They have a 6' wingspan and can grab baby lambs.
A few years ago, she got llamas, which tend to help protect them.
I wrote about the farm a while back, and looked up the detail, "180 babies were born at Ninety Farms, but between the eagles and coyotes, they've lost 50." So, at that point, they were loosing 28% of the babies to predators.