If the spur is within the pit from where it grows from good chance it is female and if it falls outside of the pit its most likely a male. Honestly, I think the best way to tell is how the tail tapers(other than probing). I had about 30 Argentines last year that I just went through, eye balled them by tail taper, and went back through later with a probe and I only missed one.
Later-
Matt Schubarth
Pet Nebula

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• I think my girl is a boy! any opinions? - AbsoluteApril, Fri Aug 19 11:26:18 2005
• RE: I think my girl is a boy! any opinions? - bthacker, Fri Aug 19 12:02:06 2005
• RE: I think my girl is a boy! any opinions? - AbsoluteApril, Fri Aug 19 12:54:14 2005
• RE: I think my girl is a boy! any opinions? - Randy_Middleton, Fri Aug 19 14:56:36 2005
• Its the "Bulge" that gives it away. . . . . - Fred Albury, Fri Aug 19 15:02:50 2005
• thanks guys!! - AbsoluteApril, Fri Aug 19 16:04:20 2005
• Ok now I'm second guessing..... - drasticplastic, Fri Aug 19 17:58:16 2005
• RE: Ok now I'm second guessing..... - Biophiliacs, Fri Aug 19 18:11:31 2005
• RE: Ok now I'm second guessing..... - AbsoluteApril, Fri Aug 19 18:27:05 2005
• real annoying isnt it - BOASELECTER, Mon Aug 22 10:58:48 2005