Does anyone know what would cause a duck to lay an egg with blood on the outside shell? This is the second one we found. Our oldest duck is 2 years old. The amount is about the size of a penny
Duck egg with blood on outside shell
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You will occasionally see blood on the outside of an egg - any minor irritation to the inside of the vent can result in a bloody shell exterior as it is an area of the body rich in vessels that is stretched significantly as the egg passes through. I wouldn't worry too much until/unless it becomes an even more frequent thing - if you are concerned, and if your birds are manageable, you can always catch them up and give them a once over to rule out any obvious signs of trauma in the area.
- Overrun with Runners
I did notice some blood on an egg - so I started inspecting vents, and found that Elfie - who does not like to swim - had some dried poo on the feathers around her vent, and I think that caused extra pulling when she laid the egg. I trimmed it off - carefully!