This odd object was found in a meadow near a pond in Suffolk (Bradfield St. George near Bury St. Edmunds).

It is roughly 5cm round (or 2 inches), and weighs next to nothing- it's feather light. My scale wouldn't even measure it, and you can see through it.  It feels and looks like a seamless bubble made of onion skin! 

At one end is what looks like a dried stem?

There were no plants or animals nearby to indicate possible origin, and so far no one has been able to figure out what it is! 

The suggestions I've had so far include:

A fish stomach, inflated when the sun warmed the gasses inside-

an empty sheeps testicle (?!)

a potato gone horribly, horribly wrong. 

I'm at a complete loss!!!  Please help.

These photos were taken in my parent's garden, Gloucestershire, during the snowy weather in January earlier this year.

The first photo shows the footprints starting near to the back door of their house, the second shows them making their way past the side of the house in a very straight line and the final photo shows them simply stopping.

We're still all very puzzled and wondered if anyone had any theories or ideas?

While hiking through the forest near Arenal volcano with my family, we encountered the "furry stumps with claws" shown in the photos.  Can anyone tell us what they are called so we can do some more research on them?

Description of image: It has a tiny hole in it (almost visible in the pic) and hairline fractures (not visible in pic). Image taken using a USB microscope. Found the object on my shirt cuff. it measures 0.9mm diameter and is spherical.