Pterodactyl told his son,
"When Rex comes, you must flee, must run."
"But, Father dear, I cannot walk,
Nor jog, nor crawl, nor even hop."
"I meant, son, you must fly away."
"But Father, please, I want to play."
"Then when Rex comes he'll eat you whole."
"But I am indigestible."
"He still will chomp you with his teeth."
"He cannot through my armored sheath."
"What sheath? My son, you've none attached."
"I have the egg from which I hatched."
"That egg is thin and fragile, too."
"Then, Father, I shall hide behind you!"