Legend of Dinosaurs and Monster Birds1977

Horror Vault's take

When a Japanese geologist begins investigating the volcanic caverns beneath a remote mountain lake, he uncovers evidence that something enormous and ancient has survived into the modern world. What starts as a scientific curiosity rapidly escalates into a terrifying fight for survival as the region's inhabitants come face to face with creatures that should be extinct. Blending late-70s tokusatsu spectacle with genuine creature-feature dread, this Japanese cult entry delivers prehistoric monsters on the rampage against a backdrop of volcanic peril.

Content: Creature Violence, Animal Peril, Disaster Sequences