Iago, a donkey, was 1 of Oscar the Grouch's pets. His 1st appearance on Sesame Street was in Season 21. Oscar had gotten him on his trip with the gang to Montana. Getting him out of Oscar's trash can was a struggle, but they finally lured him out with carrots.
He reappeared recently with the name "Eriberto" in a "Global Grover" segment about Mexico.