Of course. All animals have a personality of their own, but some species/breeds tend toward certain personality traits.
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If they are siblings, I find that they do not differ in whether they get along better or not. As for same, but not related, I found that the boys get along quicker, but seem to have more tiffs (dominance settlements) down the road then the girls.
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I think getting a related, same-sex pair would be best.
__________________ Usagi no Tsukiyo Rabbitry http://www.tsukiyo.org
Quality Mini rex rabbits, raised with love.
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Professional quality websites made how you want them, priced so you can afford them