''Metoolithus'' is an oogenus of fossil bird egg from

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...

. It is known from a single, near-complete egg, as well as several eggshell fragments. They are small, (60 mm x 44 mm) and spheroid. They show a mix of

avian Avian may refer to: *Birds or Aves, winged animals *Avian (given name) (russian: Авиа́н, link=no), a male forename Aviation *Avro Avian, a series of light aircraft made by Avro in the 1920s and 1930s *Avian Limited, a hang glider manufacture ...

and non-avian characteristics.

References

Fossil parataxa described in 2013 Egg fossils {{eggshell-stub