 These insular guinea pigs have a much slower maturation rate than other cavies.Researchers observed 4 distinct classes within "C. intermedia" by distinguishing ossified sutures; Age 1 is classified as young without any ossified sutures, Age 2 is classified as 1 ossified suture ranging <400grams, Age 3 is classified as a subadult missing one ossified suture and weighing 400-500g, Age 4 is classified as an adult with all three ossified sutures weighing over 500grams.From age 1 individuals vary from 100g-150g when not bred in captivity (99g).