which picture doesn't belong?

and why?

Now that the School District has admitted that they have no copyright on the information and pictures posted on their website, we are again able to take this public information, gathered, processed, and presented with public funds and post them on the Valhalla Voice.

Here are six pictures from Valhalla's website. Today's question is:

"Which doesn't belong and why?"

The answer is the cow of course. Not because there is no cow in Valhalla, but because there was a cow in Valhalla.

Is it getting to be time to put the public school system out of its misery?