I'll suggest green iguana. Don't knock them just because they're herbivorous (as far as that goes)! As babies they are very social and look after each other. Males will protect their sisters by leading predators away or covering them with their own bodies. As adults they split apart and get more solitary. There are males which display to attract females, and there are males which forcibly mate. The fact that they have appeasement behaviors also suggests that they can hurt each other, and getting defensively whipped with their tails is very painful. They are also not generally seen as affectionate, though they can be.
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I'll suggest green iguana. Don't knock them just because they're herbivorous (as far as that goes)! As babies they are very social and look after each other. Males will protect their sisters by leading predators away or covering them with their own bodies. As adults they split apart and get more solitary. There are males which display to attract females, and there are males which forcibly mate. The fact that they have appeasement behaviors also suggests that they can hurt each other, and getting defensively whipped with their tails is very painful. They are also not generally seen as affectionate, though they can be.