It wouldn't be Halloween without ghosts, witches, black cats and bats, would it? Well, according to Yorkshire Water's ecological experts, you may be hard-pressed to see a bat this weekend. It's down to the weather. Thanks to recent cold temperatures there are fewer insects around and many bats have gone into hibernation already. Says Yorkshire's Richard Hampshire: "We've noticed that many of our bat populations have already given up hunting for bugs and other insects and have retired to the sanctuary of their winter roosts." Pictured are two Nathusius' pipistrelle bats, who don't look too happy posing for a photograph.

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