give me by size or by age ranges if possible please. I ask only because All of the live rat providers (Reynolds, Wilsons..etc.) in central iowa were wiped out thousands of animals dead from the heat this year... my guy/girls didn't respond to the F/T that i tried.. they don't like to feed if they see me or the tongs... not sure which it is... they ended up waiting almost 3 months one lost a lot of weight the other two (older than 4 years) are holding weight thankyou for your time