Gerbils are interesting rodents. I used to keep a group to feed a trio of Ball Pythons. Unlike mice, they didn't seem to do well in communal groups, rather they did better in pairs. They are definitely less stinky then mice - and a little slower to breed. Still, between 2 gerbils vs. 3 BPs, in a year or so there were more Gerbils than all the snakes could eat.
They showed a lot of genetic variation, with various color and pattern morphs, e.g, normal, albino, black, ginger, and piebald. Interestingly, a trait that came out was "fainting" - sort of an extreme freeze-response. These guys would keel over at the slightest hint of danger, appearing as dead as the best Hognose. A great defense against BPs! Then there was the "ninja" strain, which were so fast and agile as to be essentially untouchable by the fastest BP. Besides that, Gerbils have a high "cute-factor".
Gerbils do make excellent feeders, and provide larger individual servings. They are easily bred, and low maintenance. Unlike mice and rats, the skin covering their tails will come right off, interfering with the "whack 'em on the edge at a hard object" killing method.
I think they make an excellent supplemental food source to augment mice/rats in the diet of any mammel-eating snake, and they can't be beat for keeping BPs.
Hope this helps,
John D.
-----
I am so not lesdysxic!
0.1 Creamsicle Cornsake "Yolanda"
1.0 Bairds Ratsnake "Steely Dan"
0.1 Desert Kingsnake "FATTY"
0.1 Black Rat (WV Rescue) "Roberta"