Adult hookworms are usually between 7 and 15 mm long, so yes they are visible. The males are smaller than the females. You normally don't see them until after treatment and the dead adults are voided in the feces from the host animal. Hookworms can cause pretty substantial damage and even be fatal in heavy loads if not treated. It is normal to see some blood along with voided dead hookworms. That is because they make their living by attaching themselves to the intestinal membranes and sucking blood. When they turn loose, the area they were attached to will bleed a little. If you have several hundred hookworms turning loose at the same time, you can see some blood in the feces.

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• Roundworms? - xelda, Mon Nov 24 00:31:42 2003
• RE: Roundworms? - lizardman, Mon Nov 24 04:03:06 2003
• I didn't think hookworms were visible? - xelda, Mon Nov 24 12:21:31 2003
• RE: I didn't think hookworms were visible? - oldherper, Mon Nov 24 13:58:48 2003
• still puzzled - xelda, Mon Nov 24 15:23:18 2003
• RE: still puzzled - oldherper, Mon Nov 24 15:55:30 2003
• RE: still puzzled - bigboi, Wed Nov 26 01:48:06 2003