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.
black swan eggs are the same as any other eggs. so, its a white-ish color.
white or brown like most common ducks
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.
The answer is, the colour and the pattern of the egg and the shape.
The walls were painted an egg yellow.
White
BLUE
brown
White
A platypus's egg is a pale, cream or creamy-grey colour.