1. Ostriches: Ostriches lay the largest eggs of any living bird. Ostrich eggs can weigh up to 1.4 kilograms (3 pounds) and measure up to 15 centimeters (6 inches) in length.
2. Emus: Emus are another large bird that lays big eggs. Emu eggs can weigh up to 900 grams (2 pounds) and measure up to 13 centimeters (5 inches) in length.
3. Cassowaries: Cassowaries are large, flightless birds that are native to Australia and New Guinea. Cassowary eggs can weigh up to 650 grams (1.5 pounds) and measure up to 12 centimeters (5 inches) in length.
4. Rhea: Rheas are large, flightless birds that are native to South America. Rhea eggs can weigh up to 600 grams (1.3 pounds) and measure up to 11 centimeters (4.5 inches) in length.
5. Emperor Penguins: Emperor penguins are the largest penguins and lay some of the largest eggs among penguins. Emperor penguin eggs can weigh up to 460 grams (1 pound) and measure up to 10 centimeters (4 inches) in length.
6. Leatherback Sea Turtles: Leatherback sea turtles are the largest sea turtles and lay the largest eggs among reptiles. Leatherback sea turtle eggs can weigh up to 150 grams (5 ounces) and measure up to 6 centimeters (2.5 inches) in length.
7. Saltwater Crocodiles: Saltwater crocodiles are the largest living reptiles and lay large eggs. Saltwater crocodile eggs can weigh up to 110 grams (4 ounces) and measure up to 8 centimeters (3 inches) in length.
8. Giant Squids: Giant squids are the largest invertebrates and lay large eggs. Giant squid eggs can be up to 15 centimeters (6 inches) in diameter and contain thousands of smaller eggs.