I'm seeing Jungle in the mix. Sad part is, 20-30 years ago, breeders thought adding Jungle to Coastal would make for better looking animals...but it did the opposite. True Coastals are not as common these days.
Reputable breeder - my coastals came from Nick Mutton, they will be breeding next season - www.inlandreptile.com is him. Anthony Capenetto over at www.acreptiles.com is also working with the same lines as Nick, and then we still have www.australianaddictions.com, Kerry King over at Psychotic Exotics (sire of my Coastal Jag) also works with tracable lines. Head patterns have a lot of tell tell to them. Sometimes striping / pattern coloration can be indicative, but more time than less, most people do head studies to try and visually determine mixes vs high% to pures. I will say that after 87.5%, you will not be able to visually distinguish them from a pure (Per communication with Nick Mutton). But mutt snakes are a huge problem. Especially with people trying to get the Jag gene into other complexes, and now getting the Zebra and Granite and Caramel into other complexes as well. (Zebra = Jungle, Caramel and Jag = Coastal, Tiger (polygenic) = Coastal, and Granite = Irian Jaya, Albino = Darwin, Ivory = Jungle, Axanthic = Jungle). Anything else, just ask.
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*note australian addicitions is Justin Julander, not sure I distinguished that enough*
Many of my stuff can be seen at www.flickr.com/codyconway, Just updated some ball stuff, but will be working on catching up on the Carpets very soon, waiting for my IJ granites to come in.
7.6 Ball Pythons, 2.3 Carpet Pythons, 1.0 Green Tree Python, 4.5 Reticulated Pythons, 1.0 Burmese, 0.1 Woma, 2.3 Western Hognose, 1.1.2 Milk Snakes, 2.2 BCI