This video series from the USA is called Ohio Bird Calls.
From the Cornell Lab of Ornithology in the USA, February 2019:
New Study Based On Ohio NestWatch Data
A new study based on Ohio’s Eastern Bluebirds and Tree Swallows sheds light on how future climate scenarios might impact nesting birds. The study was recently published in the journal American Midland Naturalist and included 4,417 NestWatch records. Distilling 16 years of first-egg dates, the research examines how the timing of egg-laying overlaps with insect pest emergence in Ohio, and how cavity-nesting birds might help benefit farmers in Ohio.
As always, we thank NestWatchers for making studies like this possible. Read more about the study on our blog.