Oscar Brown Jr. penned the lyrics later for the song's release on his 1961 début album Sin & Soul...and Then Some, as he did with two other recent jazz instrumentals, Mongo Santamaría's "Afro Blue", and Nat Adderley's "Work Song". Brown's lyrics describe a child's curiosity and excitement on a visit to the zoo with his father, and the parent's reflections on the child's growing up.
It features a joint trumpet and tenor saxophonesolo from measures 9 through 23. Then the saxophone takes its own solo from measures 34 through 59, sporting a D minor- B minor7 (b5)- E minor7 (b5) chord progression. At measure 59 the whole band joins in for a loud and proud "shout chorus". It takes the coda back to 18, and once measure 30 is finished, it is open to the whole band to solo individually.
A Norwegian version, "Den der", was performed by Eva Trones on the 2011 record Tango for en ("Tango for one") with lyrics by Terje Nilsen. The sentence "And mummy can I have that big elephant over there?" was translated rather freely to "Og mamma kan æ få sånt høyt hår som ho dama der?" ("And mummy can I have such tall hair as the lady there?")