Taxonomy
Taxonomy on Drupal is used to classify content. A site's taxonomy is made up of vocabulary which are inturn made up of terms. For example, NHMLAC's sites have vocabulary such as "Topics" which contains terms such as "Birds", "Bugs", "Cats", etc. These terms can then be used to classify content types such as "Events" and "Exhibits" in views, such as the Pages by Topic.
Finding a Taxonomy ID
When passing a topic to a view, the taxonomy id is required as an argument. Much like pages, which are assigned node ids, taxonomy terms are assigned taxonomy ids.
Navigate to Taxonomy
A list of all taxonomy vocublary can be found at /admin/structure/taxonomy.
Find the vocabulary you want to use
Find the vocabulary you want to use and click on the "List terms" button.
Find the term you want to use
Click on the link under the Name column.
Click Edit
The page url should look something like:
{domain}/{vocabulary}/{term}
Inspect the URL
The taxonmy id is the number at the end of the url, i.e.
https://nhm.org/taxonomy/term/41