A mess at the show, & he's left with a "Bread Island Dwarf Mammoth", a cousin of wooly mammoth, to hide. And he hides it at the home of his "Mawmaw". Title is the name Tommy & his mawmaw have given to the mammoth.
Story is mostly troubles & emotions of mawmaw keeping the animal out of its time happy, & of her relationship with her difficult son.
Fact sheet.First published: The New Yorker, 24 December 2012.
Download full text from publisher's site. [via QuasarDragon]
Author elaborates on the story background in this talk with Cressida Leyshon.