I bought several sizes and two of this size for when my caterpillars were getting ready to become chrysalids. I use plastic containers for the small caterpillars til when they become stage 5 and ready to pupate. The tops of these give plenty of room for about 16-20 chrysalis's. However, when they eclose (hatch), I have another one of these right next to it and put the monarch in those when they have dried off and starting to walk around the top of the cage, stretching their wings. I put them in the second one that has no chrysalids because I don't want them to hurt their wings by hitting the other chrysalids nor do I want the other chrysalids to be disturbed. Also, having a second one allows me to take all the active butterflies out to release them without having to worry about the chyrsalids as they stay back home out of the sun. I LOVE the double zipper of these cages. I had an old one with one zipper and you have to be careful when you take out one butterfly to feed because suddenly it seems like the other ones find the opening! I love the 2 zippers because I can fit my hand in there just large enough to get the one butterfly to tag or feed and then able to quickly zip up the small opening. I love the double netting because it keeps even the smallest of gnats out. Item always arrived quickly, great communication with the seller and I always bought the different sized ones from this seller because they stand behind their work. One of my large ones came in cattywompus and they delivered a new one immediately! I just can't say enough about the seller. OH! The reason why I got the medium to giant size was if there was a lot of rain in the forecast for days, I was able to keep all of the butterflies happy by being able to let them exercise their wings and to be able to fly in the extra large one. The giant XL one is large enough to fit up to a pre-teen child, not that you will put your children in there of course! I love the convenience of being able to fold the cages inward to flatten them and then they pop out in a perfect cube every time. I traveled every weekend, an hour away and I would have to bring all my chrysalids in one small cube, the newest butterflies in the second small cube, the older ones in the medium sized cage, and brought the ginormous pop-up one so they could have a "play pen" like you would have one of those "fold and go" things for a toddler that you brought everywhere. Sorry to ramble on. hope this helps those who are helping to save the monarch populations. Only 3% of adult Monarchs make it to adulthood. The pop up laundry hampers that are cheaper, have holes that are too large and that could let in parasitic wasps and tachinid flies that will eventually kill the monarch by having maggots crawl out of the chrysalid. THATS why you need this container, the double netting wont let ANYTHING in. When the season is done, you can just pop close all the cages and put them away (after bleaching of course). Oh! and when I bleached (1 part bleach to 9 parts water), the color didn't bleach out! Not even a little bit!
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