What is OTB?? Well, it could mean several things...
Off-Track Betting
On the Beach
On the Border (a Mexican restaurant)
One Touch Backup
Out-of-the-Box
Open-To-Buy
On the Border (a song by the Eagles)
Over the Bridge
On-The-Ball
Only the Best
On the Border (a song by Al Stewart)
Object Test Bench
Over the Bars
Operations Training Branch
On the Border (a cache exactly on the SD and WY line)
One Time Buy
On Target Bonus
Object Transaction Broke
Only one of these is true. Based on the cache location, it should be easy to make the connection. You are looking for a small bison tube, just hanging around at an obvious spot waiting to be found. You do not need to disturb the environment, the wildlife, or dismantle any object to find this. No tools or blow torches needed. You will need to bring your own writing utensil to log the cache.
Please cache sensibly, watch for traffic, and have fun. If you hear music however, it's all in your head. It isn't real.