For the safety assessment of outdoor pesticides, up to four separate bird feeding studies have been conducted so far (Sub-Acute Avian Dietary Tests). Some of these tests are now waived if the authority has sufficient information to ensure that a pesticide registration is also possible without the tests. 

With the decision, the number of tested birds can be reduced by about 720 birds per year.

Further information:
https://www.epa.gov/newsreleases/epa-takes-important-step-reduce-unnecessary-animal-testing
https://www.epa.gov/pesticide-registration/bridging-or-waiving-data-requirements