Possible Clues:

• Animal with a reddish summer coat
• Small graceful animal with no visible tail and a reddish summer coat that turns greyish in winter
• Cervine animal
• Wildlife rights must protect old English river
• One given to ruminating came 'ither by boat, we hear
• Antlered Eurasians
• Animal came 'ither by boat, reportedly
• 'The horse-like bark of the — . . . puzzled him very much' (Samuel Smiles, Life of a Scotch Naturalist)
• Wandered constantly, never seeing very small animal
• Having eggs always produces small animal