Assertion: horseshoe crab's tail | /r/HasProperty | about 15 cm
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Source sentences:
text: On average, males of C. rotundicauda are about 30 cm (12 in) long, including a tail (telson) that is about 15 cm (5.9 in), and their carapace (prosoma) is about 15 cm (5.9 in) wide.