The main predators of the garden warbler are Eurasian sparrowhawks and domestic cats. Some falcons will also take adults, and the Eleonora's falcon hunts the garden warbler and many other small passerines as they migrate across the Mediterranean.Walter (1979) p. 144. Eurasian jays and Eurasian magpies take the eggs and young of warblers, as do mammals such as stoats, weasels and squirrels.Mason (1995) pp. 49–53.Gibbons et al. (2012) p. 35. The garden warbler is a host of the common cuckoo, a brood parasite.Mann et al. (2012) p. 479. The blackcap has a much lower level of parasitism than its relative because the cuckoo's eggs are often rejected.
