Canada has lost over 60% of its flying insects since the 1970s, leaving tree swallows smaller and less successful at breeding
https://timesofindia.indiatimes.com/science/canada-has-lost-over-60-of-its-flying-insects-since-the-1970s-leaving-tree-swallows-smaller-and-less-successful-at-breeding-scientists-found/articleshow/132176920.cms

Birds: 60% decline in Ireland since 1970s
Wild salmon: 89% decline in Ireland since 1970s
Butterflies: 80% decline in Ireland since 1970s
Butterflies: USA lost 20% of butterflies between 2005 and 2025
Flying insects: 75% decline in Germany in 27 years