In the past, Kanji Chapter 29 had a different definition for あたま. It definitely used to be just "head". But you're right, it is wrong now. Strange.
Vocabulary Chapter 21: 頭【あたま】"head"
Kanji Chapter 29: 頭【あたま】"counter for large animals (e.g. head of cattle)
February 8, 2016 at 4:49am