At some point in shapinglight's story, Spike wonders how he is going to eat without his horn getting in the way. Good question, I thought. Somehow I'd always thought that narwhals used their horns to spear fish, but on second thought that seemed rather impractical.
When googling to find out how narwhals do eat, I stumbled across a site with The 7 Most Interesting Narwhal Facts. Some of these facts turned out to be pretty interesting indeed (I thought so at the time, anyway) and inspired me to create some silly pictures:
The narwhal photograph I used as a base is by Paul Nicklen (source).