Silverfish

While decking your halls, why not sing biology inspired carols such as O Chromosomes and this song I found over on Ugly Overload, about silverfish.

Silver Fish
(to the tune of Silver Bells)

City cellars
Moldy cellars
We have just ventured down
To the basement to get things for Christmas
Lots of boxes, stacks of boxes
I think this one's the tree
As we move them we're likely to see...

Silver fish, Silver fish
Its Christmas time in the cellar
Centipedes, race with ease
Soon it will be Christmas Day

Strings of webbing
Spider webbing
We're disturbing their lairs
As we track down our holiday treasures
Its disgusting
These need dusting
'fore we take them upstairs
And along for the ride there will be

Silver fish, Silver fish
Its Christmas time in the cellar
Centipedes, race with ease
Soon it will be Christmas Day

The song is correct, silver fish most often feed on polysaccharides (aka complex sugars like cellulose and starch) including book bindings, glue, hair, and paper. The wikipedia article points out that

"The damage caused by silverfish is negligible and they have no direct effect on human health beyond psychological distress to those who are frightened or disgusted by their appearance."

Here, here, they sort of give me the heeby jeebies too.