This is to assist in using the correct pellet and gun for the varmit to enable the correct shot for a quick, clean, humane kill
Sparrow 2.0ft-lbsPP
Valley Pocket Gopher - 3.0ft-lbs**
Squirrel - 3.0ft-lbs
Pigeon - 3.0ft-lbs
Rabbit - 5.0ft-lbs
Crow - 5.0ft-lbs
Groundhogs 10+ft-lbs
Raccoon - 40ft-lbs**
Fox - 65ft-lbs**

Lower fpe estimates from another independent source
Gray squirrel/Fox Squirrel - 4.5fpe
Eastern Cottontail/Swamp Rabbit - 4fpe
Jack Rabbit White, Black, and Jack O' lope - 4.5fpe
Raccoon/ Bandit - 10fpe.
Virginia Opossum/ County Rat - 10fpe
Ground Hog/ Wood Chuck - 7-8fpe
Gray Fox - 8.5fpe
Red Fox - 9.5-10fpe
Bobcat - 9fpe
Crow - 3.5 fpe head, 6fpe body/vitals
Pigeon - 3 fpe head, 5fpe body/vitals
Sparrow - 2.5fpe
Typical Pellet Velocity (fps) for Required Energy

Racoon
.22
920fps with 21.4 gn (Beeman Kodiak)
790fps with 28.4 gn (Eun Jin)
(the Benjamin Marauder can't use Eun Jin pellets because they are too long for the magazines even with machining)
Crow or Rabbit 5.0ft-lbs
.177
535fps with 7.9gr pellets = 5.0ft-lbs
.22
400fps with 14.3gr pellets = 5.1gr pellets
Squirrel - Starling - Pigeon-Pocket Gopher 3.0ft-lbs
.177
415fps with 7.9gr pellets = 3.0ft-lbs
.22
310fps with 14.3gr pellets = 3.1ft-lbs
Sparrow - Mouse 2.0ft-lbs
.177
345fps with 7.9gr pellets = 2.1ft-lbs
.22
255fps with 14.3gr pellets = 2.1ft-lbs

Benjamin Marauder 2500 psi Factory Settings Pellet Energy and FPS
Crosman Premier Domed 14.3gn - 850 fps 22.95 ft-lbs
Crosman Premier Hollowpoint 14.3 gn - 850 fps 22.95 ft-lbs
Beeman Kodiak 21.4 gn- 750 fps26.74 ft-lbs
Gamo Magnum 15.89 gr -870 fps 26.71 ft-lbs**
RWS Superdome 14.5 gr - 891 fps 25.57ft-lbs**
RWS Superpoint 14.5 gr - 887 fps 25.34 ft-lbs**
RWS Super H Point 14.2 gr - 891 fps 25.04 ft-lbs **
Hobby 11.9 gr - 921 fps 22.42ft-lbs**
Gamo Raptor PBA 9.9 gr - 965 fps 20.48 ft-lbs**
References
http://f4bscale.worldonline.co.uk/over.h…
http://www.americanairgunhunter.com
http://www.adventuresinairguns.com
http://www.americanairgunhunter.com/racc…
**educated estimate
A Hunter's testimony
Here is a list of the things I have killed with an air rifle in over a half century WITH BRAIN SHOTS;
Small birds, quail, grouse, pigeons, pheasants, ducks, geese, turkey, rabbits, squirrels, rats, groundhog, prairie dog, raccoon, marten, skunk, possum, ferial cats and a badger.