For #LongTailedTits, it really does take a village https://phys.org/news/2025-05-tailed-tits-village.html paper by Jennifer Morinay et al.: https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2656.14237
"about 70% of long-tailed tit nests are destroyed by predators every year... By early May, the season is too advanced to re-nest, and if a pair has lost their brood they give up for the year... they often become helpers, moving to another nest and assisting... Around half of all broods have helpers, typically just one or two, but up to eight at a single nest."