👉 Heracleidae is a family of extinct marine animals that lived during the Late Cretaceous period, around 65 to 80 million years ago. This group consisted of a wide variety of small, herbivorous marine reptiles that had a unique adaptation for their diet. The exact number and characteristics of heracleids are not known with certainty due to the lack of fossil records from this time. Some scientists believe they may have been smaller than modern crocodilians and likely lived