built a 20L x 5W x 6H fly pen as soon as we got them - didn't fly much at first - more with practice - more yet after wife landscaped the pen and started feeding fruit/vegie trimming scraps, plus their own and chicken egg shells beside flight conditioner feed-&-seed-bought meal - 6 months later, 12 of 18 original still living - biggest problem, rats breaking into cage or raccoon trying - when the bandit shows up, send out the pup to chase it off - rats eat the fly conditioner feed and eggs - but when they do get in the little birdies really fly - hmm ... rats train birds - birds train pup - how do rats get trained?