Bird egg

Bird egg

Observation - Bird egg - UK and Ireland. Description: Two-thirds of a birds egg was found in the undergrowth around some large trees - no nest was visible. Can anyone tell from the way it was cracked what caused this? Also what bird species it belongs to?

Two-thirds of a birds egg was found in the undergrowth around some large trees - no nest was visible. Can anyone tell from the way it was cracked what caused this? Also what bird species it belongs to?