A few years ago, Nortel/STC (a Canadian company which makes telecoms equipment) built a UK corporate HQ in New Southgate, North London
This building was next to an ornamental pond, with several ornamental geese.
It was a high tech building where it was possible to enter the (unstaffed) office reception by approaching the automatic doors which had infra red detectors on them (like the ones used for security lamps).
The door exits were initially controlled by pressure pads.
Now geese have enough of an infra red “signature” to get in to the building, but are not heavy enough to trigger the pressure pads…Apparently the geese were in there for 6 hours until the first person showed up. I expect the janitors were not happy…
