Answer: the smallest bird egg in the world is the egg of honey sucking hummingbird. Its body length is only 5cm, which is equivalent to the length of half a finger. Its egg is even smaller. It is only the size of a coffee bean and its diameter is no more than 0.6cm. It is basically similar to insect eggs.
The smallest bird egg in the world: bee sucking bird egg bee sucking bird is the smallest bird in the world, so its egg is also the smallest bird egg in the world. Long ago, the record of the lightest honey sucking hummingbird egg was 0.4990g, but now there are two eggs with a diameter of less than 0.99cm, breaking the record, one is 0.3629g and the other is 0.3742g. Appearance characteristics of honey sucking hummingbirds the feather color of honey sucking hummingbirds is very gorgeous, especially the male birds. There are shiny rainbow feathers on the head and neck, but they only remain in the breeding period and fall off after that, mainly to attract female hummingbirds. The most special feature of honey sucking hummingbird is its needle like mouth, which can easily insert into the stamens and suck nectar. Breeding habits of honey sucking hummingbirds honey sucking hummingbirds produce 2 eggs per nest, which are pure white, generally no more than 0.6cm. They can hatch in about 14 days. Generally, females raise their offspring alone, while small honey sucking hummingbirds can leave their parents in about 18-38 days. Honey sucking hummingbird is not only the smallest egg, but also the smallest nest. Its diameter is only 3 cm. It is mainly made of some moss, hair and even spider silk.