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0005721Dwarf FortressCreaturespublic2012-03-28 08:052012-03-28 08:31
resolvedno change required 
0005721: Rattlesnakes and copperheads do not lay eggs
I checked the raws, and rattlesnakes and copperheads do not have a lays_egg tag under female caste. Other reptiles do lay eggs, so I assume this is a simple bug. Here is a list of some other reptiles that do lay eggs, which is why I assume this is a simple oversight:

Helmet snake yes
Copperhead (+giant) no
rattlesnake (+giant) no
Kingsnake (+giant) yes
Monitor Lizard (+giant) yes
Salt, Cave Crocodiles + alligator yes
Pond, snapping, etc. tutrles (+giant) yes
tortoise + giant, +gigantic yes

There are other creatures (giant insects, giant frogs, giant crabs, giant slugs, etc.) that don't lay eggs, but I assume that any egg-laying behavior by these creatures should probably handles differently since they either lay underwater, lay egg sacs, or whatever.
Just have a look at the raws
No tags attached.
related to 0007653resolved Toady One Rattlesnakes and Copperheads missing [CHILD:x] tag, won't breed 
Issue History
2012-03-28 08:05MisterstoneNew Issue
2012-03-28 08:31FootkerchiefNote Added: 0021838
2012-03-28 08:31FootkerchiefStatusnew => resolved
2012-03-28 08:31FootkerchiefResolutionopen => no change required
2012-03-28 08:31FootkerchiefAssigned To => Footkerchief
2014-07-26 19:25DwarfuRelationship addedrelated to 0007653

2012-03-28 08:31   
Rattlesnakes and copperheads are viviparous:
http://en.wikipedia.org/wiki/Rattlesnake#Reproduction [^]
http://en.wikipedia.org/wiki/Agkistrodon_contortrix#Reproduction [^]