Do rats kill wild birds?

"Whilst rats are known to attack live prey, this is normally in captive situations, for example, bird aviaries and chicken coops. "They will go for easy or slow victims first - eggs, chicks and slow or cornered adults. ... "That being said, I've never seen a rat successfully pluck a bird right out of a tree before.

Are rats a threat to birds?

Invasions of alien mammals, particularly predators such as rats Rattus spp., have been a major cause of the disproportionately high number of extinctions of island birds.