The Unidentified dinosaur fetuses were three dinosaur fetuses who were all each unidentifiable to an existing dinosaur species that was seen inside the InGen Compound in Jurassic Park III.
Story
These dinosaurs were created by InGen scientists in their compound om Isla Sorna like the rest of the dinosaurs that were created by InGen[1] for the purpose of sending it off to the neighboring island Isla Nublar to serve as attarctions for Jurassic Park that was also owned by InGen.[2]
While they were still gestating, the InGen workers on Isla Sorna evacuated the island due to Hurricane Clarissa.[2] In the process, they abandoned their compound along with the unborn dinosaurs that they had created and cared for, leaving them to die and decompose in the following years since they had abandoned the island.[1]
The fetuses was still present inside their gestation tubes by 2001 and the rescue team for Eric Kirby saw them when they went inside the InGen Compound during the Isla Sorna Incident of 2001. Billy Brennan even took a photograph of one of the dinosaur fetuses that were still present.[1]
Behind the scens
In the level "Breeding Facility" of LEGO Jurassic World, the three fetuses are replaced by a fish, a baby Velociraptor, and a Compsognathus trapped in one of the tanks.