Starlings like to nest in the eaves of houses, which can cause problems and lead people to replacing their soffits and blocking off potential nesting sites.

Source: https://www.hemeltoday.co.uk/news/environment/starlings-the-marmite-birds-where-have-they-all-gone-4444235

Swifts have found nesting places in the eaves and crevices of older houses for centuries.

Source: https://www.cravenherald.co.uk/news/23329471.silsden-plans-swift-action-save-threatened-bird-species/?ref=rss

The new entrance bricks are small enough to allow in swifts but keep out jackdaws who had previously damaged the brickwork in the chancel eaves.

Source: https://www.hampshirechronicle.co.uk/news/23225792.local-news-alresford-area-including-cheriton-tichborne/?ref=rss

There, just outside the snack bar, under the eaves, a row of dirty Formica tables with plastic bench seats had offered a place to rest, to set down the overstuffed bags that burdened her.

Source: https://www.city-journal.org/article/the-element-of-crime-part-one

This year, Cowan saw the cliff swallows were back, building their mud nests under the eaves of the tower.

Source: https://www.cbc.ca/news/canada/british-columbia/grant-narrows-cliff-swallow-nests-1.6932312?cmp=rss

Tongue-and-groove cladding under the eaves.

Source: https://mynorth.com/2023/02/take-a-look-inside-this-vintage-lake-lodge-on-walloon-lake/

When winter snow gets deep, the area under the eaves of the house is often the easiest place for wildlife to walk, which is also where window wells are located.

Source: https://www.eastidahonews.com/2023/12/protect-wildlife-clear-property-of-entanglement-hazards/