The back half of the lid is one solid piece that can be removed or slid over if I need to get to that part of the pen. The front half is hinged in the middle and either side can be lifted and folded over the other. It's held down with eye hooks when closed. I wish we had made both halves hinged. Even though I rarely need to get to that part of the pen, it's kind of a pain when I do because that lid is heavy!
Yes they are male and female. They started mating last fall, so I expect I'll have babies before too long. I was afraid I was going to have to divide the pen to separate them because he wouldn't leave her alone at first. But the "romance" seems to have cooled off now - for the time being anyway.
They're fed a variety of things. Some superworms, silkworms when I have them, earthworms, snails, other caterpillars and grubs, etc. that I know are safe - lately they've been eating a lot of cicadas. I also feed them various fruits and veggies and several varieties of turtle pellets. I like to soak the pellets in water and then mix them with chopped up greens, etc. Neither one will eat many veggies unless I mix them with the pellets. I also have strawberries and other edible things planted in their pen. When they were babies I fed them almost every day but now I usually feed them about 3 days a week in the summer, a little more in the spring and then in early fall. With the 13 year cicadas out right now I've just been throwing cicadas in the pen whenever I find a live one on the ground, so they've been feasting.