Any idea what might causes these holes in concrete walkway?

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pagetrip

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We recently noticed a lot of holes on our concrete walkway. I am pretty sure they were not there a month ago but all of a sudden there are a lot of holes. Any idea what might have caused this? This does not look like ants and I am not sure what treatment would apply here. Any help is appreciated. Thanks.

Location is Seattle.

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WhatsApp Image 2021-05-28 at 12.42.04 PM (2).jpegWhatsApp Image 2021-05-28 at 12.42.04 PM (1).jpeg
 

havasu

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Subterranean termites?
 

Flyover

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It looks like your concrete has small stones embedded in it. Could it be that in the winter water gets in between the stones and the cement, freezes, expands, and crumbles away the surrounding material allowing the stones to come loose, leaving a cavity behind?
 
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