You should take a look at the Candoia forums here at kingsnake.
http://forums.kingsnake.com/forum.php?page=1&catid=194
C. carinata are notorius for switching to mice. Don't even bother with chicks, these are not typical tree boas. If it is 17 inches, then it is capable of eating mice-however it may never have done so. You will need to get geckos as feeders if the following does not work. Try LLL Reptile for geckos. However, these 2 methods first:
1) get a HOPPER mouse (not a fuzzy) and put it in the cage with the snake in the evening and leave it alone over night. Carinata will respond to hoppers over others.
2) get a pinkie and "cup" it with the snake also overnight (I have done this by placing the cup in the cage so it keeps temp and humidity).
Keep in mind that these are not easy snakes to keep, but once you have the right setup and have them on small mice, it is much easier. Make sure your temps are 75-80 and humidity at 40-60% (i.e. somewhat humid but not wet). I have found that C. carinata responds well on reptibark substrate with plenty of hide spots (they like to ambush prey). They spend a great deal of time on the ground.
Good luck and I hope that helps!
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John R. Stebbins
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0.1 Candoia bibroni australis
0.2 Candoia carinata carinata
2.0 elaphe guttata guttata