Rabbits tend to avoid plants in the nightsahde (solanacea) and onion (lily) families because they are not good for them. Pretty much everything else is fair game. They don't bother the corn leaves too much, but, they will eat the fruit (ears).
I don't know about okra, but I don't really have that much trouble with rabbits usually. My biggest problems are with deer. They eat everything, too, except the onions and nightshades.
There is a poison in nightshades, called solanine, most animals avoid it. I t is found in the green tissue of this family. That's why it's not a good idea to eat green potatoes.
The major plants in this family are potatoes, tomatoes, eggplant, peppers, tobacco and oddly enough petunias. Most are native to the New World.
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