Do grey squirrels eat baby birds?
Not only are grey squirrels widely believed to eat bird nestlings and eggs, they’re also blamed for occupying valuable tree cavities that could otherwise be used by birds for nesting. Until recently there was little evidence either way, but a study conducted by the Centre for Ecology & Hydrology has found that both effects are negligible. While the squirrels do eat eggs and chicks on occasion, only 0.5 per cent of nests are affected. Similarly, they take over only a small fraction of potential nest sites. Neither effect is likely to have much impact on native bird populations overall.
Grey squirrels get a lot of flak, but eggeating is not their modus operandi.