In everyday folklore, a barking spider is the supposed source of an otherwise unexplained fart. The joke works because the sound is instantly recognisable and the creature is remarkably difficult to produce on demand. The recordings here are sound effects that illustrate that usage. Real Australian tarantulas also have regional names including barking and whistling spiders; their defensive stridulation is a different subject.
What belongs in a field note
Keep the place, sequence, and your interpretation separate. Write down what happened before the sound, what you heard, and what the room did afterwards. A useful description leaves room for another reader to reach a different conclusion.
Start with a recording
A short rasp beneath a chair. A rolling rumble in a quiet room. Barking spider is the wonderfully convenient name given to these encounters. This reference brings the recordings together, with descriptions that help you tell a brief bark from a sustained one.
Listen to the sample collection and compare the notes. The labels concern the sounds; the stories concern the people who heard them.