Confusion at WWT Martin Mere

I know the black swan is a southern hemisphere resident but I would have thought nesting in October was not a particularly good idea. My cats get confused when the clocks change by an hour, this poor female has got her internal clock confused in a big way.Her mate is faring no better, he is chasing all the wildfowl that end up in his pool in protection of her and her unhatched eggs.
Extras show other residents of the Mere behaving more normally, if two pheasants balanced on a 5 bar gate can be considered normal.