“When birds see a dog, they see a predator.”
Naturalist Chris Packham is pleading with dog owners to keep their pets on a lead during bird breeding season.
The BBC Springwatch presenter told BBC Radio Wales Breakfast that when a dog disturbs a bird on the nest it an abandon its eggs.
Natural Resources Wales and RSPB Cymru say birds that nest in long grass or on beaches are most vulnerable.
Video edited by Greg Davies
