in the Usa was credited to AP, in the UK as Trad. ... (7" single speaking)
from Wiki:
The Animals version was played in 6/8 meter, unlike the 4/4 of most earlier versions. Arranging credit went only to Alan Price. According to Burdon, this was simply because there was insufficient room to name all five band members on the record label, and Alan Price's first name was first alphabetically. However, this meant that only Price received songwriter's royalties for the hit, a fact that has caused bitterness among the other band members ever since.[3
I believe Mike Jeffries, the Animals manager had Price's name put on as composer. It should have been 'traditionally arranged by the Animals'. Price could have shared the royalties but he didn't.