First welcome to the chameleon forums,the veiled chameleon(CHAMAELEO CALYPTRATUS)are a large specie of chameleons and they grow fast,they demande large caging(24x24x48)is actually just an average size cage for 1 adult calyptratus and like ghettomike is saying the problem is that chameleons in general are very territorial animals and especially male veiled chameleons,they are extremely aggressive toward each other,but in a much larger enclosure or free range setup a male calyptratus will coexist well with one or more females if you are interested in breeding,number of eggs per clutch 30 to 70 but should be supervised by experience chameleon keepers.To finish the chamaeleo calyptratus is a very temperature tolerant and hardy specie,very good specie to learn about chameleon keeping.