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These small spiders construct delicate sheetwebs near the soil surface and are commonly found in forested areas . What of Madagascar 's geologic future ? Death from viperid bites is generally caused by a collapse of blood pressure . Further , more records may be returned if the fields for " genus " and " species " are left blank . All business , Bandar identifies it as a male harbor seal , measures its body size , looks for signs of trauma , and then checks to see if its head is reasonably intact . Viperid venoms , on the other hand , contain an abundance of protein-degrading enzymes called proteases , which produce the symptoms like those encountered by the unlucky rattlesnake handler : strong local swelling and necrosis , and blood loss from cardiovascular damage complicated by coagulopathy , or disruption of the blood clotting system . Elapid bites can also produce symptoms typical of viperid bites , and many viperid bites result in neurotoxic symptons . Viperid venoms , on the other hand , are messy - tearing apart tissues and literally melting cells .