- 227 gram(s)
- Ireland (Tuam,County Galway)
The heaviest duck egg weighed 227 g (8 ounces)and measured 14 cm (5.5 in) in height with a circumference of 20 cm (8 in). The egg was laid in November 1999 by a White Pekin duck owned by Willie and Kitty Costello, of Tuam, County Galway, Ireland. When the outer shell was broken, another egg was found to have been perfectly formed inside, which in itself is very unusual.