It may be able to with a small dog, over 10 pumps, at close range.
It is not designed to kill a Turkey. It is designed for simple plinking and target practice.
If:It is close rangeYou use enough pumpsThe crow is standing perfectly stillYou are an excellent shotAnd you put it right through the crow's eye,Then yes, you can kill a crow with a Crosman Pumpmaster 760.
See the link below for the owners manual.
There are nine different versions of the 760 pumpmaster, see the link (below) and find your version. Check the parts manual for a diagram.
No the Pumpmaster has more power and can shoot BBs or Pellets
The 760 is not designed for rodent control. It was designed for simple back yard target shooting. You may be able to kill the snake but it most likely would take several shots.
See the link below.
See the Crosman link below for the diagram.
There are 12 versions of the Crosman 760. Which one do you want.... See the link below
11 mm dovetail rail
600 FPS - Pellet 625 FPS - BB
There are several versions of the 760. See the link below for all of the crosman models with dates and manuals.