City dwellers encouraged to report monarch butterfly sightings

Watching a monarch caterpillar strip a swan plant can be one of those lasting memories from childhood. But now people are being urged to report sightings of live monarch butterflies as experts sound the alarm over their declining numbers - especially in cities. Over winter they survive by gathering in clusters on tall trees or in urban green spaces but there's been a noticeable drop off in those habitats. Jacqui Knight from the Moths and Butterflies Trust spoke to Jesse.