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Well, first off I have to say I consider myself a keeper, more than a breeder of snakes, I have had some good luck with a few rarer species but this has not always been through my own design, but rather, Mother Natures!

That said, I do produce a few clutches from my kings, hoggies and corns each year and I had only had mixed success with the comercially available incubators (could have been my own inexperience at incubating eggs!). So I bastardised this method I use currently from an insert in one of Bartlett and Bartlett books (I forget which one).

I've used this method for a few years now and have still maintained a 100% successful hatch rate on all fertile eggs incubated - a higher percentage than I got from the standard "polybox" incubators!

The way I do this is to fill a 9L Really Useful Box about half to two thirds full of water. I then place a small aquarium heater set to the required temps. Over the mouth of the box I stretch a pair of standard woman's tights (usually unknowingly donated by my Mother... ) onto which the eggs will be placed. Once everything is in place, put the lid on the box, make sure the box is out of the way (where it won't be knocked accidentally - the bottom shelf of a rack may be good) and leave it alone.

It sounds slapdash and unscientific, but hey, it really works! I use this method for species as diverse as Corn snakes, Kingsnakes, Hoggies, Boiga, Philodryas baroni, Dendrelaphis pictus and so on. It can be adapted for pythons, but you'll need a bigger, deeper box to support to eggs as they are so huge!

The tights are permeable, so they'll keep the eggs suspended in constant humidity. The beauty of the system is that it's completely self-contained, just put a row of them on an empty shelf and leave nature to do its work!

Something else that people who have tried this have expressed concern over is the water droplets that condense upon the lid of the box. Now, the eggs shouldn't be touching the lid, they should ideally be suspended by their own weight above the water, just off the lid. This way they are spared the worst of the condensation. I take the lid off every few days and shake the excess water off it, but in my experience it hasn't caused any problems for the eggs (even for the eggs of species I had previously been told would be destroyed by water droplets, namely Philodryas baroni).

Just to illustrate what I mean, here are some piccies of the setup with some Cornsnake eggs (in full, glorious nightvision!) so you can get a rough idea of the setup...

This site has information on the following genera of Ratsnakes ... Spilotes, Spalerosophis, Ptyas, Zamenis, Elaphe, Rhinechis, Senticolis, Pseudelaphe, Pantherophis, Bogertophis, Orthriophis, Gonyosoma, Oreocryptophis, Oocatochus, Euprepiophis, Coelognathus, Archelaphe