SWEARING IN
The Puzzlemaster Presents Vol. 2
Will Shortz

The word INAUGURATION contains the names of five animals. No letter can be used in the animal names more often than it appears in INAUGURATION. The number of letters in the names are 3, 3, 4, 6, and 9. Can you find them?

Answers:

RAT
GNU
GOAT
IGUANA
ORANGUTAN