Key themes in The Enormous Crocodile by Roald Dahl.
The crocodile is so greedy that nothing he has is ever enough. His greed drives all his terrible plans and ultimately leads to his destruction.
The crocodile cannot resist telling the other animals his plans. His boastfulness gives them the information they need to stop him. Dahl suggests that arrogance is dangerous.
The children in the story are protected not by adults but by the animal community acting together. Cooperation and mutual care defeat the threat.