How Big Are Hummingbird Eggs. A penny could fit in the inside of a nest and cover three eggs. The female lays her eggs on different days.
They normally only lay 2 and incubation does not start till the second egg is laid. They weigh less than two grams — less than a dime. Smaller hummingbirds will build nests that are half the size of a walnut shell.
For comparison, a large chicken egg weighs about 40 times as much as the largest hummingbird egg.
The female lays her eggs on different days. They begin life as the smallest eggs in the world. A hummingbird nest compared to a quarter. Mother hummingbirds know exactly how to incubate the eggs to make this happen.