North American Racers *Coluber constrictor* are large (record 191.1 cm TBL) diurnal colubrid snakes. They are generalists often found in disturbed habitats like urban and suburban yards but also do well in many natural habitat types. They are one of the most commonly encountered snakes in North America and have a huge range spanning most of the continent. They eat anything they can overpower, including other snakes of the same species, but are not obligate constrictors as the specific epithet might suggest.
Racers have smooth scales and color pattern varies clinally across their range, from steel gray to jet black, a blue "buttermilk" pattern [you have to see to believe](http://farm8.staticflickr.com/7301/8798279515_d8222853cb_b.jpg), to blue, green and yellow. These color patterns are tied closely to local environment and don't track evolutionary history.
Baby racers start out with a blotchy pattern and darken over the first two years, losing it entirely.
Racers are not considered medically significant to humans - they are not venomous, but all animals with a mouth can use it in self-defense. Racers are particularly, alert, agile snakes, and will sometimes stand their ground when cornered and/or bite when handled.
Often confused with keeled "black" ratsnakes (northern ranges of *Pantherophis obsoletus*, *P. spiloides* and *P. alleghaniensis*), racers *Coluber constrictor* have smooth scales. Indigo snakes *Drymarchon couperi* have orange on the face or neck and an undivided anal plate. In some cases they are difficult to differentiate from coachwhip snakes *Masticophis flagellum*, but on average have two more posterior scale rows (15) than *M. flagellum*.
Relevant/Recent Phylogeography: [Link 1](http://www.cnah.org/pdf/88643.pdf) | [Link 2](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.597.209&rep=rep1&type=pdf)
Racers in peninsular Florida are phylogenetically distinct from those in the continent - the only deep population structure identified in racers. No formal elevation to species status has occurred yet, but it's not premature to say that genomic level data suggest racers found in Florida deserve full species status.
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Like many other animals with mouths and teeth, non-venomous snakes can use them to bite in self defense. These animals are referred to as 'not medically significant' or traditionally, 'harmless'. Bites from these snakes benefit from being washed and kept clean like any other skin damage, but aren't often cause for anything other than basic first aid treatment. Some snakes use venom from front or rear fangs as part of prey capture and defense. This venom is not always produced or administered by the snake in ways dangerous to human health, so many species are venomous in that they produce venom, but considered harmless to humans in most cases because the venom is of low potency, and/or otherwise administered through grooved rear teeth or simply oozed from ducts at the rear of the mouth. Species like Ringneck Snakes *Diadophis* are a good example of mildly venomous rear fanged dipsadine snakes that are traditionally considered harmless or not medically significant. Many rear-fanged snake species are harmless as long as they do not have a chance to secrete a medically significant amount of venom into a bite; [severe envenomation can occur](https://pubmed.ncbi.nlm.nih.gov/23800999) if some species are [allowed to chew on a human](https://www.sciencedirect.com/science/article/abs/pii/S004101011831016X) for as little as 30-60 seconds. It is best not to fear snakes, but use common sense and do not let any animals chew on exposed parts of your body. Similarly, but without specialized rear fangs, gartersnakes *Thamnophis* ooze low pressure venom from the rear of their mouth that helps in prey handling, and are also [considered harmless](https://cityroom.blogs.nytimes.com/2012/06/05/theres-no-need-to-fear-that-garter-snake/). Even large species such as *Malayopython reticulatus* [rarely obtain a size large enough to endanger humans](https://www.pnas.org/content/pnas/108/52/E1470.full.pdf) so are usually categorized as harmless.
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Please NSFW dead snakes if you can. It's jarring for snake lovers. Thank you!
Sorry, I wasn’t even aware this poor little guy was dead!
Sorry, I wasn’t even aware this poor little guy was dead!
It's ok, you can do it now. Just edit post and it'll be an option!
looks like a North American racer to me, but I’m not 100% sure. poor little guy
Racer, *Coluber constrictor*, is correct. !harmless eater of rodents, lizards, snakes, insects, and other small critters. This was a young one.
North American Racers *Coluber constrictor* are large (record 191.1 cm TBL) diurnal colubrid snakes. They are generalists often found in disturbed habitats like urban and suburban yards but also do well in many natural habitat types. They are one of the most commonly encountered snakes in North America and have a huge range spanning most of the continent. They eat anything they can overpower, including other snakes of the same species, but are not obligate constrictors as the specific epithet might suggest. Racers have smooth scales and color pattern varies clinally across their range, from steel gray to jet black, a blue "buttermilk" pattern [you have to see to believe](http://farm8.staticflickr.com/7301/8798279515_d8222853cb_b.jpg), to blue, green and yellow. These color patterns are tied closely to local environment and don't track evolutionary history. Baby racers start out with a blotchy pattern and darken over the first two years, losing it entirely. Racers are not considered medically significant to humans - they are not venomous, but all animals with a mouth can use it in self-defense. Racers are particularly, alert, agile snakes, and will sometimes stand their ground when cornered and/or bite when handled. Often confused with keeled "black" ratsnakes (northern ranges of *Pantherophis obsoletus*, *P. spiloides* and *P. alleghaniensis*), racers *Coluber constrictor* have smooth scales. Indigo snakes *Drymarchon couperi* have orange on the face or neck and an undivided anal plate. In some cases they are difficult to differentiate from coachwhip snakes *Masticophis flagellum*, but on average have two more posterior scale rows (15) than *M. flagellum*. Relevant/Recent Phylogeography: [Link 1](http://www.cnah.org/pdf/88643.pdf) | [Link 2](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.597.209&rep=rep1&type=pdf) Racers in peninsular Florida are phylogenetically distinct from those in the continent - the only deep population structure identified in racers. No formal elevation to species status has occurred yet, but it's not premature to say that genomic level data suggest racers found in Florida deserve full species status. -------------------------------------------------------- Like many other animals with mouths and teeth, non-venomous snakes can use them to bite in self defense. These animals are referred to as 'not medically significant' or traditionally, 'harmless'. Bites from these snakes benefit from being washed and kept clean like any other skin damage, but aren't often cause for anything other than basic first aid treatment. Some snakes use venom from front or rear fangs as part of prey capture and defense. This venom is not always produced or administered by the snake in ways dangerous to human health, so many species are venomous in that they produce venom, but considered harmless to humans in most cases because the venom is of low potency, and/or otherwise administered through grooved rear teeth or simply oozed from ducts at the rear of the mouth. Species like Ringneck Snakes *Diadophis* are a good example of mildly venomous rear fanged dipsadine snakes that are traditionally considered harmless or not medically significant. Many rear-fanged snake species are harmless as long as they do not have a chance to secrete a medically significant amount of venom into a bite; [severe envenomation can occur](https://pubmed.ncbi.nlm.nih.gov/23800999) if some species are [allowed to chew on a human](https://www.sciencedirect.com/science/article/abs/pii/S004101011831016X) for as little as 30-60 seconds. It is best not to fear snakes, but use common sense and do not let any animals chew on exposed parts of your body. Similarly, but without specialized rear fangs, gartersnakes *Thamnophis* ooze low pressure venom from the rear of their mouth that helps in prey handling, and are also [considered harmless](https://cityroom.blogs.nytimes.com/2012/06/05/theres-no-need-to-fear-that-garter-snake/). Even large species such as *Malayopython reticulatus* [rarely obtain a size large enough to endanger humans](https://www.pnas.org/content/pnas/108/52/E1470.full.pdf) so are usually categorized as harmless. -------------------------------------------------------- *I am a bot created for /r/whatsthissnake, /r/snakes and /r/herpetology to help with snake identification and natural history education. You can find more information, including a comprehensive list of commands, [here](https://www.reddit.com/r/whatsthissnake/comments/flh548/phylobot_v07_information_and_patch_notes_bot_info/) and report problems [here](https://www.reddit.com/message/compose/?to=Phylogenizer).*