A bird feeder made from an empty milk carton can become the most exciting window in the house. Build a bird feeder with kids in October and it is ready before the first frosty nights, giving the birds time to find it before winter arrives. Then the waiting begins. Who will come first: the great tit with its black tie, the tiny blue tit, or a round bullfinch with a red belly? And why are they already there at dawn every single morning, even when it is bitterly cold?
What happens to small birds when it gets cold?
Small birds like great tits and blue tits stay in Norway all winter. They do not fly south and they do not hibernate. They have to keep warm with the food they eat, which is hard work for a bird that weighs no more than a handful of sugar cubes.
At night a tit tucks itself into a crack or a dense bush and fluffs up its feathers. The air trapped between the feathers holds in heat, like a down jacket. Even so, the body uses energy all night to stay warm, and that energy comes from a thin layer of fat the bird built up during the day.
Here is the surprise: the hardest part of a tit's winter is getting through the night. By morning it has used much of its fat just to keep warm, so it has to eat its way back up every day, and winter days are short. A feeder with fatty seeds gives it a small head start. For more ways nature gets ready for the cold, see Why is autumn the best laboratory a child can have?
Why does this matter for children?
A bird feeder is a building project and a research project in one. Children plan, cut and assemble something that must survive wind and rain, then observe who uses it. The Norwegian science curriculum asks children to give examples of good animal welfare and to organise data in tables. A simple tally sheet of feeder visitors does both.
Try it at home: a milk carton bird café
Suitable for: 5–12 years
- Draw a window on two opposite sides of the carton, a little above the bottom.
- Cut out the windows. An adult can start the hole with pointed scissors.
- Push a pencil through the carton just below the windows to make perches.
- Make a hole in the top, thread the string and fill the bottom with seeds.
- Hang it where cats cannot sneak up: open around it, but with bushes nearby where birds can take cover.
- Make a tally sheet with one box per species and add a mark for every visit.
Use unsalted bird food, never bread, and keep the feeder clean so disease does not spread. You may notice that birds arrive in small groups; find out why in Why do birds fly in flocks? What happens if you hang up a second feeder with a different food and count who chooses what?
Questions to wonder about
- Which bird do you think will reach your feeder first?
- Why do some birds eat at the feeder while others grab one seed and fly off?
- If the birds could read your tally sheet, what would they say about your garden?
Every child is made of good atoms, and every child can build something that makes winter a little easier for someone else.
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