what do the mean by show marked line? in call ducks

[ourlittleflock]

I have been searching for magpie call duck eggs and found this - can you tell me what they mean and the difference?.. Is it just the coloring in the feathers?

show marked line ~ show marked magpies can hatch ducklings in the following colors:
magpie, bibbed, ancona, & white

thanks

 

[Mrs. Turbo]

I think what they are trying to say is their magpies produce all of those colors.....ours do too.

You won’t always get a perfectly marked magpie call duckling.