This tool accepts the same URL parameters as /observations, but you must add at least one of the following parameters to use it:

place_id

Example: /observations/taxa?place_id=belgium

user_id

Example: /observations/taxa?user_id=1

projects

Example: /observations/taxa?projects=10

on

Example: /observations/taxa?on=2012-01-01

d1 and d2 (max date range 1 year)

Example: /observations/taxa?d1=2012-01-01&d2=2012-01-30