Lol....this is going to turn into a "my brother can beat up your bother" kind of thing
Okay, what do you think of these points? If you placed a wild pheasant and a Mallard at 40 yards and shot each with a steel shot shell of #2's, I don't believe the Mallard is going to tough it out and survive over the wild pheasant. I say neither one is tougher over the other in this matter.
Yes a mallard's skin and bones are thicker, breast muscles are denser too, but talking about a clean "in range" shot of 40 yards or closer, both taking the same amount of velocity and pellets, they're both dead. The Mallard is not made of armor.
As far as shooting mallards vs. wild pheasants, I can say there's been many times I've been able to decoy mallards, let them land, flush them from the water, shoot three shells, loaded another shell or two into the gun and drop another mallard from the same group. I know a guy who keeps two loaded shot guns in the blind just for this reason; there's time to keep shooting.
I my experience, I can't say the same for shooting at split second flushing wild pheasants.
Also, dropping mallards into cattails, and thick grasses surrounding the pond, the dogs seems to find the crippled mallards within 5 to 10 yards of where they dropped.
Crippled pheasants. They're usually 100 yards away by the time the dogs get on their trail and the guns are reloaded.
I've also killed pheasants (pen birds for taxidermy) by squeezing their ribcage. Lights out! A few minutes later their back on their feet running off like nothing happened.
I couldn't tell you how many wild roosters I've lost in ponds. Don't ask me were or how they escape the water, but they do.
Also, if you really want a new hunter to get his first bird and you have the option of putting him on Mallards or wild roosters would you put him on decoying mallards for the best chance at his "first bird" or wild pheasants? I've always started new hunters on pen birds or ducks, not wild pheasants or ruffed grouse for that matter.
I say a wild pheasant is all-around tougher to bring down and put in the bag! That's my point and I'm sssssttttttiiiiiccckkkin toooooo it!
P.S.--Have you ever seen a Mallard to this? http://youtu.be/bn-STQyFHbs