can't remember what these are

[leeboy]

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[John Kogel]

It is a plug in the wood siding of an old house which is laying on its side. []

Often there will be rows of plugs, indicating that insulation was blown into the walls.

[Chad Fabry]

It's a vent.

[Steven Hockstein]

I assume you were you holding the camera sideways? The vent "Top" is not on top of your photo.

[kurt]

We call them vent plugs. Like Kogel said, it usually means there's blown in insulation; very common with blown in cellulose.

[Bill Kibbel]

Around here, there mostly used for venting moisture out of wall cavities, where paint perpetually blisters on the wood siding.

[BryanDaum]

And they are often painted closed like screened vents.

Bryan