Lately I bundled four observation fields to "Built Environment" project. One of them is "Habitat Use". Field can be used to describe how animal is using the habitat in this particular observation.

Possible values and examples:

• food
• water (animal accessing water)
• grit (bird using sand for digestion, maybe chalc could be added here too?)
• cleaning (any resource used for cleaning)
• nest
• shelter (animal hiding to protective surroundings)
• platform (animal resting or moving at man made (or natural) structure)
• other

Some wordings are possibly not perfect, and more could be added.

You can add the field by typing "habitat use" (without quotes) at observation fields section of your observation page. Also when you add observations to "Built Environment", values for different observation fields are asked - if you decide to use these fields, be exact, otherwise it's ok to just leave them unfilled.

Further details of the "Habitat Use" field and observation examples: https://www.inaturalist.org/observation_fields/17919