They are considerably active birds with agile, energetic movements, not dissimilar to Blue tits. Listen for their attractive song and you’ll notice a “tilu”, “tilu” call, which is sweet and harmonious, especially when a flock of Siskins are gathered together in a forest area, their preferred location.
According to the RSPB, Siskins are classified as Green Status, meaning they are not under any threat. Globally, there is a vast Siskin population, and in the UK alone there are around 369,000 breeding pairs.
One interesting behaviour is their sometimes cross-breeding with other birds, specifically canaries – although this has been influenced by humans while the birds have been in captivity. The picture showcased here is from birdinfo.co.uk where you can see for yourselves a number of different “Siskin crosses”.