But ... barbed wire could be detrimental to little fledgling birdies ... sometimes they fall from their perches before learning to fly. It would be so sad to have one fall onto the barbed wire. Snakes are a part of nature and I guess they have to eat too ... it's a shame though that they dine on bird eggs and helpless little baby birds.
Northern Mockingbirds are notorious for building their nests fairly low in the shrubbery. There was a nest with eggs in my next door neighbors yard a couple of months ago. We were anxiously awaiting the hatch but after a few weeks I hadn't noticed any sign of babies peeping so I went over and took a photo. Looks like something punctured the eggs ... possibly a snake since there had been a large black snake around her house.
A few years ago we had two baby Carolina Wrens leave the nest before they could fly. They fluttered and fell to the ground and would climb the chain-link fence and hang on while the adults went back and forth feeding them. I was so concerned that a predator would get them during the night ... one finally found his wings and took off to the trees the next day but the other little one hung out for a few days before it finally learned what it's wings were for!
It would climb up the fence as far as it could get and then be stuck beneath the top bar ... then it would flutter to the ground, walk around a bit and flutter to a nearby shrub. The parents stayed busy back and forth feeding that one for a few days until it finally got some air beneath it's wings and took off up into the tree!
I sure hope the neighborhood cat doesn't get your baby wrens before they take flight.