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Description
Various animals from the Green River Lagerstatten of Early Eocene Wyoming.

The bird is the primitive Fluvioviridavis platyrhamphus, which is suggested to have (superficially) resembled an oilbird, albeit, one with very stout feet. F. platyrhamphus, and its Messel relative Eurofluvioviridavis robustipes, are suggested to be the sister group of a large branch of modern birds, including the Piciformes, parrots, pigeons and passerines. F. platyrhamphus is believed to have occupied an insect-eating niche.

The various snakes are primitive boas of the genus Boavus, the earliest known terrestrial snake genus. The one directly below F. platyrhamphus is the smallest species, B. brevis, which is estimated to have been about 6 to 7 feet in length. Next to B. brevis is B. occidentalis, the largest known species, which is estimated to have been about 8 to 10 feet in length. Below B. occidentalis is B. agilis. Although B. agilis was also about 8 to 10 feet long, it was far more slender than B. occidentalis

Description
Various animals from the Green River Lagerstatten of Early Eocene Wyoming.

The bird is the primitive Fluvioviridavis platyrhamphus, which is suggested to have (superficially) resembled an oilbird, albeit, one with very stout feet. F. platyrhamphus, and its Messel relative Eurofluvioviridavis robustipes, are suggested to be the sister group of a large branch of modern birds, including the Piciformes, parrots, pigeons and passerines. F. platyrhamphus is believed to have occupied an insect-eating niche.

The various snakes are primitive boas of the genus Boavus, the earliest known terrestrial snake genus. The one directly below F. platyrhamphus is the smallest species, B. brevis, which is estimated to have been about 6 to 7 feet in length. Next to B. brevis is B. occidentalis, the largest known species, which is estimated to have been about 8 to 10 feet in length. Below B. occidentalis is B. agilis. Although B. agilis was also about 8 to 10 feet long, it was far more slender than B. occidentalis