Bee, I saw a 5' to 6' black rat snake in a shed not that far from the chicken coop yesterday. He had some beautiful orange/yellow flecks in the black so it was a rat snake, not a racer. It was not in the coop and had a lump in him that looked like a mouse, so I let him go. As long as they leave the eggs and chicks alone I want them around.
Bay, that's not a great hatch rate but it's not that bad, especially for the first time. There can be a learning curve. Did you look at the eggs to see if they were mostly clears or if they died during development? Were they early or late? Sometimes I get good hatches, sometimes bad, whether incubator or broody. But if you don't know what happened you don't know if you need to fix something or not.
Penny, if that chicken crows that's a dead giveaway, but mine don't always crow that much. If that chicken is anywhere close to mature and isn't trying to mount the hens it's probably not a male. Mounting is such a common flock behavior. If you can post a photo I bet Bee could tell you at a glance what gender it is. A close-up of the head often helps but I also like a shot showing profile so I can see the legs, tail, and posture.