Find the odd number / letters / word from the given alternative.

The odd one out is C. Snake.

All the other options are birds.

• A tortoise is a reptile of the order Testudines (or Chelonia) characterized by a special bony or cartilaginous shell developed from their ribs that protects its internal organs.
• A duck is a waterfowl that typically has a broad blunt bill, a short neck, a short legs, and webbed feet.
• A crow is a large black bird with a long tail and a harsh cry.
• A whale is a marine mammal characterized by a streamlined hairless body, a horizontal tail fin, and a blowhole on top of the head for breathing.