While many of our familiar songbird species are in decline, one avian character in particular has been spotted increasingly frequently in UK gardens - the goldfinch.
Now, the British Trust for Ornithology wants volunteers to help work out what has boosted the bird's numbers.
The organisation wants to know what goldfinches feed on in our gardens.
The aim is to work out whether supplementary feeding is helping the birds to thrive.
The increase in the UK goldfinch population has been dramatic. According to the BTO, it increased by about 80% between 2002 and 2012.