The Long List of the Ents

The Long List of the Ents is a list of living creatures that the Ent Treebeard, and presumably other Ents as well]], learned when he was young. When he first meets Meriadoc Brandybuck and Peregrin Took, he is puzzled by them because Hobbits are not in the list.
 * Learn now the Lore of Living Creatures!
 * First name the four, the free peoples:
 * Eldest of all, the elf-children;
 * Dwarf the delver, dark are his houses;
 * Ent the earthborn, old as mountains;
 * Man the mortal, master of horses:
 * Beaver the builder, buck the leaper,
 * Bear bee-hunter, boar the fighter;
 * Hound is hungry, hare is fearful,
 * Eagle in eyrie, ox in pasture,
 * Hart horn-crownéd; hawk is swiftest,
 * Swan the whitest, serpent coldest...

Treebeard doesn't finish the list but Merry and Pippin suggest a line to be added after Man:
 * Half-grown Hobbits, the hole-dwellers.

Later, after the fall of Isengard, Treebeard says he has put new lines into the list for Ents to remember:
 * Ents the earthborn, old as mountains,
 * the wide walkers, water drinking;
 * and hungry as hunters, the Hobbit children,
 * the laughing-folk, the little people[.]