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how do birds make their nests?

  • Written by Kiara L'Herpiniere, PhD Candidate, Wildlife Biologist, Macquarie University

I would please like to know how birds make their nests? How do they know how to weave the twigs together and what makes the twigs stick together? – Miguel, age 10, Brisbane

how do birds make their nests?

Hi Miguel, thanks for this great question!

The first thing to know is not all birds make nests. For example, emperor penguin fathers carry their precious egg on their feet (to keep it off the frozen ground).

Some birds, such as cuckoos[1], will lay their eggs in someone else’s nests. Others lay them on the ground among leaves or pebbles, or on cliffs with very little protection.

Eggs among pebbles
Some birds will lay their eggs among pebbles on the ground, which doesn’t offer them much physical protection. Shutterstock

For the birds that do build nests, there is one main goal: to keep their eggs and chicks safe.

Many places to build a nest

Many birds also make their nests in tree hollows, including parrots. That’s just one reason it’s important to not cut trees down!

Meanwhile, kookaburras use their powerful beaks to burrow into termite nests and make a cosy nest inside. And the cute spotted pardelote[2] will dig little burrows in the side of earth banks – with a safe and cosy spot for its eggs at the end of the tunnel.

The tiny spotted pardalote is one of the smallest Australian birds, and measures about 8 to 10 centimetres in length. Shutterstock

Some birds, such as brush turkeys[3], spend months building huge mounds on the ground which can heat up from the inside. The male turkey makes sure the ground is exactly the right temperature inside the mound, and then lets the female lay the eggs inside. He’ll take big mouthfuls of dirt surrounding the eggs to check it’s not too hot or cold.

What materials do they use?

Birds construct many different types of nests. There are floating nests, cups, domes, pendulums and basket-shaped nests. They can be made out of sticks, twigs, leaves, grasses, mosses or even mud.

Magpie-larks[4] (also called “peewees”), apostlebirds[5] and choughs[6] make mud bowl nests that look like terracotta plant pots[7]. To do this, they gather mud and grasses in their beaks and shake it around to mix it with their saliva. They can then attach it to a branch and build upwards until the nest is complete.

In fact, bird saliva is a really strong and sticky material to build nests with. Birds will often mix saliva and mud to make a type of glue. And some swiftlets make their nests entirely out of solidified saliva. People will even eat these nests in bird’s nest soup[8]!

Some swiftlets will make their nest entirely out of solidified saliva. Shutterstock

Willie wagtails use another type of glue - sticky spiderwebs. They “sew” grasses together using spider webs and the webs help keep the nests strong against wind and water, too. They have to perfect the technique of gathering the spiderweb though, otherwise it can get tangled in their feathers.

Willy wagtail’s nest is a neatly-woven cup of grasses, covered with spider’s web on the outside and is lined with soft grasses, hair or fur. Shutterstock

Magpies and crows, both common visitors to our gardens, are also clever nest builders. Not only can they expertly layer their sticks into a bowl, but they also use many human-made materials in their nests. You might find them using fabric, string or a wire to hold a nest together.

Some birds such as red kites have even been seen “decorating” their nests with human rubbish. And Australian babblers line the inside of their nests with a thick wall of kangaroo poo, followed by soft fluff, to keep their chicks warm.

The chestnut-crowned babbler lives in the desert and can have up to 23 birds roosting in one nest. Shutterstock

Read more: Headphones, saw blades, coat hangers: how human trash in Australian bird nests changed over 195 years[9]

The building process

To actually weave the nests, birds will usually create a base by layering sticks or twigs in the place they want it. Then they use their beaks and feet to weave a chosen materials through, to hold the sticks in place.

They can pull strips of material with their beaks over and under, just like weaving a rug. They can even tie knots! Nests can take a really long time to make, so they’re often reused year after year. Weaver birds are so good at weaving, they can build complex nests that cover entire trees[10] and have several chambers.

Check out this baya weaver bird build an incredible hanging nest using the weaving method. These birds are found across the Indian Subcontinent and Southeast Asia.

To summarise, birds are really intelligent animals. They use their intelligence, along with their beaks and feet, to find the most clever ways to make nests with whatever materials are available. And they get better at this by learning from others, such as their parents or peers.

Read more: Why are birds' eggs colourful? New research shows it's linked to the shape of their nests[11]

References

  1. ^ cuckoos (en.wikipedia.org)
  2. ^ spotted pardelote (www.birdlife.org.au)
  3. ^ brush turkeys (en.wikipedia.org)
  4. ^ Magpie-larks (www.birdlife.org.au)
  5. ^ apostlebirds (birdlife.org.au)
  6. ^ choughs (www.birdlife.org.au)
  7. ^ terracotta plant pots (www.birdway.com.au)
  8. ^ bird’s nest soup (www.abc.net.au)
  9. ^ Headphones, saw blades, coat hangers: how human trash in Australian bird nests changed over 195 years (theconversation.com)
  10. ^ cover entire trees (www.wired.com)
  11. ^ Why are birds' eggs colourful? New research shows it's linked to the shape of their nests (theconversation.com)

Read more https://theconversation.com/curious-kids-how-do-birds-make-their-nests-172391

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