The radar records each excessive loop the bee makes until she returns safely to the hive.

-Bees at hive. Bees at hive.

-So now the bees come back to the hive.

-Yes.

Over the summer, Stephan and his colleagues would be trying to find out if the virus does affect the bees' flight. We'll have to wait for those results. But this system, which allows us to track bees in a way we've never done before, should provide some important clues.

-We can testify whether their flights are close to ultima flight or not. And this is what we want to show in this experiment, whether these diseases actually do change one or all of these aspects, or perhaps none.  

What we do know about Varroa might then is that it has killed billions of bees. We know it does spread viruses, but we don't yet know what the full fact of those viruses may be. And I don't think this is the whole picture. Not yet.

Professor Simon Potts has brought me to the Oxford University Museum of Natural History to show me one of the biggest collection of bees in the UK. 

-Some of these don't look like bees, well not like bees we would expect.

-No, exactly. So it's because their incredibly diverse of what they do, and here's a really good example of how big vairiety you get. We actually have 250 species, which people would be surprised about. So people would see honeybees in the garden maybe c* one probably, but actually there's 250 to look at.