An ostrich egg can way up to 3.3 pounds. It is the biggest egg that exist on our planet and can be compared to the size of a medium cantalope. You can find more information here: http://www.eggscape.com/birds.htm...
nelz12, Answers Expert
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Then again, this answer might help you...
An ostrich can lay a mighty big egg. The average weight would be 3.3 pounds. The egg, when cracked open, looks the same as a chicken egg but much, much larger.
