Lacusovagus was a chaoyangopterid pterosaur from middle Cretaceous South America. it lived in a place where hundreds of fossils have been found. It had competition with Skorpiovenator and the biggest Mapusaurus. It fed on juvenile herbivorous sauropods like Argentinosaurus.
A Lacusovagus was seen attacking an Argentinosaurus hatchling. The Lacusovagus failed to kill the hatchling as a Skorpiovenator scared it away. Chaoyangopterid pterosaurs was then seen circling a dying adult Argentinosaurus. One was later seen picking at the bones of the carrion for any traces of meat, just before being intimidated by a Mapusaurus.
The Lacusovagus model is the same as that of the Eurazhdarcho, the Jurassic pterosaur, Alanqa, and the Chaoyangopterid pterosaur.