Field or bank vole?

Bird feeders are a great focal point but it’s not always the birds; this morning there was a small vole. Was it a field or a bank vole? The mammal society website is a good place to answer such questions.  As it was feeding on seeds, had reddish brown as opposed to greyish brown fur and a bicoloured tail (black on top, white below), I’m pretty certain it was a bank vole. They’re on the menu for tawny owls which have been very noisy these past few nights. They’re also on the stoat’s menu which recently has been seen through the kitchen window.