A method for
processing a plurality of bird eggs, particularly
unfertilized eggs, comprising: a step of transporting a first egg (E1) having a first
eggshell color and a second egg (E2) having a second
eggshell color along a transport path, wherein the first
eggshell color is different from the second eggshell color; a step of illuminating the first egg (E1) with an illumination beam (B) of
infrared light, wherein at least a portion of the light is transmitted through the egg (E1) and detected by a near-
infrared light detector (5); a step of illuminating the second egg (E2) with an illumination beam (B) of near-
infrared light, wherein at least a portion of the light is transmitted through the egg (E2) and detected by a near-infrared
light detector (5); and to determine the shell condition of each egg (E1, E2), the step of
processing the
light detection result of the infrared
light detector (5) is included, and the detection of the illumination and / or
transmitted light of the eggs (E1, E2) is performed under substantially the same illumination and / or detection conditions, respectively.