 Breeding takes place during the spring and summer . Following copulation , the female lays eggs on a daily basis over a period of several days . If an egg is lost during this time , she will lay another to replace it . There are normally four or five eggs that are ovoid in shape and pale blue or occasionally white , and they commonly have a glossy appearance . The colour of the eggs seems to have evolved through the relatively good visibility of blue at low light levels . The egg size is 26 @.@ 5 – 34 @.@ 5 mm ( 1 @.@ 04 – 1 @.@ 36 in ) in length and 20 @.@ 0 – 22 @.@ 5 mm ( 0 @.@ 79 – 0 @.@ 89 in ) in maximum diameter . 
 Breeding <a href='uninflect' title='1'><mark>takes</mark></a> place during the spring and summer . Following copulation , the female lays eggs on a daily basis over a period of several days . If an egg is lost during this time , she will lay another to replace it . <a href='dey_it' title='2'><mark>There</mark></a> are normally four or five eggs <a href='null_relcl' title='3'><mark>that</mark></a><a href='drop_aux' title='4'><mark>are</mark></a>ovoid in shape and pale blue or occasionally white , and they commonly <a href='got' title='5'><mark>have</mark></a> a glossy appearance . The colour of the eggs <a href='uninflect' title='6'><mark>seems</mark></a> to <a href='been_done' title='7'><mark>have</mark></a> evolved through the relatively good visibility of blue at low light levels . The egg size <a href='drop_aux' title='8'><mark>is</mark></a>26 @.@ 5 – 34 @.@ 5 mm ( 1 @.@ 04 – 1 @.@ 36 in ) in length and 20 @.@ 0 – 22 @.@ 5 mm ( 0 @.@ 79 – 0 @.@ 89 in ) in maximum diameter . 
Breeding take place durin the spring and summer . Following copulation , the female lays eggs on a daily basis ova a period of several days . If an egg is lost during this time , she gon lay anotha to replace it . It is normally four or five eggs ovoid in shape and pale blue or occasionally white , and they commonly got a glossy appearance . da colour of the eggs seem to done evolved thru the relatively gud visibility of blue at low light levels . The egg size 26 @.@ 5 – 34 @.@ 5 mm ( 1 @.@ 04 – 1 @.@ 36 in ) in length and 20 @.@ 0 – 22 @.@ 5 mm ( 0 @.@ 79 – 0 @.@ 89 in ) in maximum diameter .