Birds are being credited for rapid regeneration of native plants in the red zone around the Avon River in Christchurch.
Lincoln University urban ecology professor Glenn Stewart said the regeneration of native species has been rapid and, in some situations, 'prolific' in the Avon River residential red zone.
More than 100 properties throughout the red zone have been observed. Birds are dispersing native seed, and seedlings are taking hold.
Professor Stewart said substantial planting of native trees and shrubs in residential city gardens over the last several decades has provided a seed source for the regeneration.