Twelve fossil eggshell fragments revealed a previously unknown crocodilian egg type from Eocene Queensland.
1. Let's Science investigates "drop crocs," extinct Australian crocodilians associated with the warm, swampy Eocene landscape 55 million years ago.
2. Hosts Caroline and Lindsay explain a November 2025 Journal of Vertebrate Paleontology study because its Murgon eggshell evidence illuminates mekosuchine reproduction.
3. The episode's central hook is that some mekosuchines were highly terrestrial or semi-arboreal, potentially dropping from trees onto prey like leopards.
4. Murgon's Oakdale sandstone preserves the Tingamara local fauna, including mammalian giants, marsupial ancestors, snakes, turtles, and early songbirds.
5. Fossils of Cambara murogenesis and Cambara implexidens, plus tiny hatchling bones, suggest the area may have served as a mekosuchine nesting ground.
6. Researchers collected 12 fragments from Mergon's distinctive purple layer and prepared radial sections only 30 micrometers thick for polarized-light study.
7. Scanning electron microscopy showed the shells had an unfamiliar internal and surface structure, supporting a new oo genus and oo species named Waka Oolithus godelpi.
8. Quincana had blade-like xiphodont teeth suited to land hunting, while Baru occupied a semi-aquatic niche among Australia's diverse ancient crocodilians.
9. As inland waterways dried, these crocodilians faced smaller habitats, reduced prey, and competition from newer crocodile species, while modern crocodiles rely on water-based ambushes.
10. Listeners interested in paleontology, Australian wildlife, and evolutionary biology.
