1. North American subspecies of tundra swan having a soft whistling note
   - whistling swan

Type of: Cygnus columbianus, tundra swan

• cryptogram
• Cryptogramma
• Cryptogramma acrostichoides
• Cryptogramma crispa
• Cryptogrammataceae
• cryptograph
• cryptographer
• cryptographic
• cryptographical
• cryptographically
• cryptography
• cryptologic
• cryptological
• cryptologist
• cryptology
• Cryptomeria
• Cryptomeria japonica
• cryptomonad
• cryptonym
• Cryptophyceae
• Cryptophyta
• cryptophyte
• Cryptoprocta
• Cryptoprocta ferox
• cryptorchidism