Can you help identify these?

Unknown eggsDuring the litter pick on Saturday (11th May) we came across this nest of eggs along Potten Street Road.

There are about twenty eggs in total.  Does anybody know if they, or someone might be able to help us identify them?

They are nicely tucked away, and have not been disturbed, to ensure their safety – reptile, bird or ???

If you think you know, get in touch.