The 12 Days of the Ice Age

by me

Let's pretend we've sung the first 11 verses already. Now for the final verse:

On the twelfth day of the Ice Age my true love gave to me
12 humans hunting
11 glaciers creeping
10 seas a-shrinking
9 tundras freezing
8 ground sloths grazing
7 horses hoofing
6 mammoths marching
5 DIRE WOLVES
4 saber-tooths
3 cave bears
2 mastodons
AND AN ICE SHEET ON TOP OF A TREE.