And then I saw this comment on the video:
FINALLY FOUND IT! EVER SINCE MADAGASCAR CAME OUT I'VE BEEN SEARCHING FOR THIS SONG!!!!! THE NAME OF IT (The chase scene, right after Alex becomes 'wild' and chases Marty for the first time)
That makes me sad. I hope that discovering what the song is will encourage the person to go seek out the work that National Geographic has done. The magazines are still some of the coolest things ever. They're printed in such high quality paper that people hold onto them for years, as they would any sort of book.