At Ocean Beach earlier this year, around 250 people convened for a Hole Party, at which they dug holes in the sand just for fun. It was a reminder that only humans dig pointless holes; everyone else has a good reason. If you want to know what is in that hole on the side of a trail, what made it, or why it is there, get to know the diggers.

The question of what is in the hole has bedeviled me for as long as I have been taking walks. See, for example, the countless pictures of holes on my phone, which are as photogenic as you’d imagine and mostly annoyingly anonymous. So I recently dove, like Alice, down the rabbit hole that is the subject of holes.

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Kate Golden is Bay Nature's senior editor. Her background is in investigative, data-driven, and science journalism, and she has reported from rural Australia to the Bering Sea. She is also an artist, cyclist and sailor. Send tips to kate at baynature.org, or find her on Instagram at @meownderthal.