Swallow's eggs can be a variety of colors. Often an off white with black/brown spots. But they can be pure white, eggshell blue or pink. Sometimes these colors are spotted other times not.
Purple and white
well if you have a barn swallow egg get a nest with feathers and put it in the sun make shore nothing gets to it.
An egg? Though not to snakes who swallow them whole.
About 15 days.
it is a white like a chickens egg. I amansweringthis question because i have a sparrow egg of my own.
White
BLUE
brown
The walls were painted an egg yellow.
The answer is, the colour and the pattern of the egg and the shape.
White
A platypus's egg is a pale, cream or creamy-grey colour.