It becomes stiff and apears dead.
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With syrians you may see a milky discharge (just small amount) and freezing in the mating postition with back end up in the air and sometimes a 'Musky' scent. They also come into heat every 4-5 days except during winter.
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One way is to gently but firmly run your finger along her back. If she sort of brings her body close to the ground, and "freezes" (not moving) then chances are she probably is.