The video is by Annet Piet in the Netherlands.
Also about tree sparrows: here.
- The Sparrow House (themirrorobscura.com)
- House Sparrow (tomwarrenphoto.wordpress.com)
- Celebrating the Wild Side of Yorkshire’s Coast & Country: Who shot Cock Robin? The now, not-so-common House Sparrow (ianswalkonthewildside.wordpress.com)
- Non-native house sparrow bullied its way to becoming one of America’s most common birds (bangordailynews.com)
- Sparrows (heronthereeverywhere.us)
- Slow siskin migration in the Netherlands (dearkitty1.wordpress.com)
- Secret Behind Invasive House Sparrow Success: Sharpening Immune Cells (scienceworldreport.com)
- Who Killed Cock Robbin? (rajivchopra.me)
- Red-tailed Hawk, Tree Sparrow, and White-Throated Sparrow (birdingnh.com)
- Ten Years at a Mason County, Illinois, FeederWatch Station (theriverlanding.typepad.com)