Cob: Cob? Well, carpenter bees.

[Amanda Peck]

More than you wanted to know if you don't have them in your area.

They are definitely around in mine, and seems like most of Middle 
America--Georgia to Iowa anyway.  After twenty years of boring, one or two 
fence crossrails at my house in Nashville had holes every four or five 
inches.  Note recommendations about "just caulking them in."  Wood boring 
bees seems to be an alternate name.


"http://www.ces.ncsu.edu/depts/ent/notes/Urban/carp-bee.htm"

Carpenter bees are large, black and yellow bees often seen hovering around 
the eaves of a house, wooden fences, or the underside of a deck in late 
spring. They are most often mistaken for bumble bees, but differ in that 
they have a black shiny tail section.The carpenter bee is so-called because 
of its habit of excavating tunnels in wood with its strong jaws. The round 
half-inch diameter entrance holes are usually found on the underside of a 
board.

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