I just recently within the last week got 4 ducklings from my local Tractor Supply. They are about 2 weeks old now. I got a little Pekin and 3 other ducklings. They have the same base pattern. Dark stripe across back fatter on the butt, head cap, eye stripes.The brown one is patterned just like the other 2 (whom look very similar) but is way lighter. Any ideas?? I'm a little lost on what these guys are.