Reminds me of a site we used to work at. There were ducts under the floor of the building that were regular haunts for adders. You thought twice about shoving a cable through a duct, pulling up the next access point and groping around under the floor to find the end of your cable
At least they keep the mouse population in check, so there isnt so much rodent damage to cables.
A trick much used by London drug dealers - leaving snakes in the heater ductwork - tends to give any new plod a fright when searching the car for illegal substances.
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