both, we had 3 hatch last night/early this morning, you'll hear a little peeping and you'll hear a little pipping, but really watch when it starts rocking and rolling!! very exciting, I happened to have company over last night and there were about 8 of us that were able to witness the actual hatch, it was awesome but from the first little tiny "pip" (very small hole in egg) to the actual hatching was about 8 hours...but the action started getting pretty intense and we were able to witness....wish I would have video'd it but was too interested in seeing it myself for the first time....