Garden Bird Nesting Success and Welfare

Garden birds face welfare challenges during nesting including predation, parasitism, food availability, and human disturbance that thoughtful garden management can reduce.

Key Facts

Blue tit nesting success is closely linked to caterpillar emergence timing in deciduous trees
Nest parasites including blow fly larvae (Protocalliphora) can kill nestlings
Domestic cats kill an estimated 55 million birds annually in the UK
Supplementary feeding during the breeding season benefits adults but may reduce nestling diet diversity
Removing nest boxes prevents repeat nest building but birds are very site-loyal

Welfare Considerations

Garden bird nesting welfare is influenced by multiple intersecting factors: food availability during the feeding-chick phase determines chick survival; predation from cats and corvids kills adults and raides nests; parasites cause direct chick harm. Garden management that retains insect-rich planting, installs appropriate nest boxes in predator-protected positions, and keeps cats confined during nesting season directly improves welfare outcomes for nesting birds at the individual and population level.

What You Can Do

Plant caterpillar host plants (oak, birch, hawthorn) to maximise insect availability
Position nest boxes away from perches that cats could use as jumping platforms
Keep cats indoors from April to July when bird nesting is at its peak
Clean nest boxes in autumn to remove parasites before spring occupation
Avoid disturbing nesting birds even when monitoring for your own curiosity