Jammer Anthem is a members-only song for dens that was first released on August 9, 2011, as one of the default den music choices for members. On October 27, 2011, it was removed as a default music choice and was sold at the Music Shop instead, but in 2012 it was relocated to the New Year's Party, where it returns every year. It can be bought for now at the 2018 New Year's Party.
This song starts with a hip-hop style that changes into more of a rock style after the intro. It has an upbeat melody played primarily by an acoustic guitar with accompanying parts from a flute and a violin. The song includes children singing and cheering in the background. At the end of the song, a voice can be heard saying "I love Animal Jam."