The answer to this question depends on their ages.
For my adult I cut the squashes into fairly thin strips, maybe an 1/8th to a 1/4 inch wide and tall, and 1/3 to 1/2 in long. or in little cubes. I usually hand feed the squashes because my Uro loves them, so they are a treat. Hence the longer cut so I can hold onto them. I do leave the skins of the zuchini on them, unless they are particularly tough. The squashes I grew in my garden this year had really tough skins so I have been cutting them off.
For babies though, you would want to cut them up much much smaller than that, and I always remove the skins for the babies.
I hope that is a little help. The Uro love bug is definitely catching!
Glad to have you on the board. There are a lot of very knowledgeable people here who love to help people and discuss their views on Uro care, so it is a great resource!
Elizabeth
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1.0 Uro Archimedes
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Indiana & Wisconsin