Like in the other Double Bass Project pieces, the bass part is playable on open strings. But in this piece the bass section gets to show off a little, too, starting at letter B. Who says open string parts have to be dull?
The brachiosaurus is way too awesome a creature to have a regular ending to its dance. In the last chord, everyone should play as high a note as they can on their instrument. This will result in a sort of microtonal cluster. What the brachiosaurus actually does (or says) here, I leave to the imagination of the musicians!
P.S. Complete parts for the Brachiosaurus Boogie and the other Dino Dances (with a bonus movement!) are available at Sheet Music Plus: Dino Dances for Junior String Orchestra