There are several types of eggs consumed by humans, with chicken eggs being the most common in the UK. Other types include quail, duck, goose, and emu eggs. Quail eggs are very small with a spotted appearance while duck eggs are high in fat, protein, and remain fresh for an extended period. Chicken eggs come in various colors and sizes depending on the breed and can range from small to extra large. One medium boiled chicken egg provides 84 calories, 8.3g of protein, and 5.7g of fat.