Percy and Frank stumbled backward.
“Um…is that thing tame?” Frank said.
The horse whinnied angrily.
“I don’t think so,” Percy guessed. “He just said, ‘I will trample you to death, silly Chinese Canadian baby man.’”
“You speak horse?” Hazel asked.
“‘Baby man’?” Frank spluttered.
“Speaking to horses is a Poseidon thing,” Percy said. “Uh, I mean a Neptune thing.”
“Then you and Arion should get along fine,” Hazel said. “He’s a son of Neptune too.”
Percy turned pale. “Excuse me?”

The Son of Neptune, Chapter XXXII