I love old Ogden, but on this
I must be quite contrary.
This memory trick distinguishes
Bactrian from dromedary.

First, capitalize each one's name.
Now take the initial letter
And turn it ninety degrees to left
To make the shapes match better.

Observe the camels' backs and lo!
The answer's plain to see.
Two humps are on the letter B
But one hump on the D.