Instruct: Given a premise, retrieve a hypothesis that is entailed by the premise.
Query: In Greek mythology, Orthrus (Greek: Ὄρθρος , "Orthros") or Orthus (Greek: Ὄρθος , "Orthos") was, according to the mythographer Apollodorus, a two-headed dog who guarded Geryon's cattle and was killed by Heracles. He was the offspring of the monsters Echidna and Typhon, and the brother of Cerberus, who was also a multi-headed guard dog.
Orthus was killed by Heracles.
In ancient Roman religion, Antevorta was a goddess who had a brother that was also a god.
The Orkoraptor was a titanosaur.
Haplocyonoides was the most feared animal in europe for several years
Bowser was the neighbor's dog.
Oceanus was also worshipped by other religions in the world
the Hesperides were part of a fish species
Ophelia once met an Owlbear.
Haplocyonoides was the dominant carnivore at its time.
The Phu Quoc Ridgeback is a dog that brings luck 
Barbatodon witnessed dinosaurs roaming around.
The team found the remains that allowed for the connection between one type of prehistoric animal and a later version of it.
Eurylochus accompanied by others did not look through a closed doorway
Horsa had a sister.
Orthrus is from Norse mythology. 
the Hesperides were part of an insect species
The other fellow did not have a Flying Horse, but a unicorn.
The dogs were both black.
Barbatodon were predators of dinosaurs
Oceanus was worshipped by the Celts
algirdas was a brother of kestutis
they also had a dog
Heracles killed Orthrus with a large knife.
Cerberus was a single-headed guard dog. 
Orthrus was killed by his brother Cerberus. 