Felger describes the sorts of data an ornithologist would be interested in collecting and then delineates how to create a spreadsheet (though he doesn't use this term) for collecting this data.
In a follow up article five years later, he suggests using a card index system instead. See: @Felger1907 whith notes at: https://hypothes.is/a/qeki7oU4EfGv8QNy5SVDgA
Susan Athey, July 22, 2020. (2020, August 2). https://www.youtube.com/watch?v=hqTOPrUxDzM
Carrying out qualitative research under lockdown – Practical and ethical considerations. (2020, April 20). Impact of Social Sciences. https://blogs.lse.ac.uk/impactofsocialsciences/2020/04/20/carrying-out-qualitative-research-under-lockdown-practical-and-ethical-considerations/