Possible Clues:

• If you want a little bird, just ring for it, by the sound of it
• Immature swan
• An ugly duckling
• Young bird not going far from its pen
• The sound of the ring of 14 across across and 7 down
• Sounds as if one might give the Ugly Duckling a ring
• Reported seal - one seen swimming near pen
• Aquatic creature - a seal, by the sound of it
• Young water-bird
• A little bird tells me that's the sound of a ring