They are naturally very inquisitive, especially if they are in lamb, or just had lambs. This makes they more nosy, as they want to ensure you aren't trying to hurt their babies. This means they are going to watch your every move.
I especially love taking photos of lambs at this time of year, as they are so cute, and big enough that they are willing to check out what you are up to.
Please check out my Facebook page, for some photos of my sheep and lambs. And, if you like the page, let me know how you found me. Thanks so much. And hope this helped :)