The studying of eggs is a comparatively rare field in the studies of birds and raptors everywhere. In Taiwan, bird researchers seldom publish any data related to raptor eggs. For example, the Crested Serpent Eagle (Spiolornis cheela) is a species commonly observed and recorded in Taiwan, yet information related to its egg is almost non-existent. In this note, the author shares his measure results using 3 Crested Serpent Eagle’s eggshells retrieved from abandoned nests. By collecting fundamental data such as sizes and description of shell samples,knowledge related to the species could be expanded. The author also demonstrated some simple methods to measure egg using incomplete shells.