Hi Whistler, i think you may be onto something with the artificial light, our Chipmunks have light 24 hours a day as we always have a light in the front room and they have a flurescent light on from 8 am until 8 pm every day, we got this for Pearl's benefit as after she got ill i read that having access to full spectrum lighting such as used for lizards would help give Vit D to her to help with calcium, as she was suffering from a calcium deficiency. She seems better now and we are not sure whether that is due to the light or to the calcium diet she is given but decided to carry on with the light anyway.
I always thought cage size was important but maybe not as much as i'd heard. The cages i have may be smaller than my first cage but they were sold as Chipmunk cages, i would never keep one in a cage meant for a Hamster that would be cruel, the Chipmunk would probably go mental in there. Didn't those Chipmunks at the breeder fight in there? Pearl was the only one kept in a Hamster cage but it was to restrict her movement as she was weak and could have hurt herself in the main cage, once she got better we was put back in the larger cage, originally with Abigail. I'm not sure they are having babies, the females were coming into season every 10 days now its 14 days but they are coming into season in the time frame for Chipmunks not pregnant. Only one female mated last month so their later calling can't be because they are pregnant. For one female, two weeks is now up, for the other two wednesday will be 2 weeks since they last called. I expected them to call today but they didn't so i expect they will tomorrow or wednesday, i wouldn't be surprised if two call on the same day like last time or i could be wrong and all three will call on the same day as all three are nearly overdue, that will be a headache!
Everything i have read about breeding Chipmunks says that the male will not harm the babies, the mother will just kept him out of the box until they are a few days old, it is also said that males help look after the babies which they wouldn't do in the wild.
Thanks for replying