bird’s stick nest: structural and material analysis · material bird uses certain type of...
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Bird’s Stick Nest:
Structural and Material Analysis
Sira Sriswasdi
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ShapeThere are three common shapes: Cup, Saucer, and Platform
1. Cup
General – common among songbirds. This is the common nest with hemispherical inside with a rim height several times the diameter of the eggs.
Main Material – grasses, plant fibers and down, small twigs.
Lining Material – usually the same as main material but finer, lichen, rootlets, hair, or feathers.
Adhesive – most of the time, nests are bound by spider, cocoon
stationary on the tree.
Example of birds: Warbler, Kingbird, Jay, Hummingbird, and Sparrow
silk, or mud. Strengthen the nest and keep the nest
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2. Saucer
General – a shallow nest with the height of the rim not more
than two times the diameter of the eggs.
Main Material – sticks, reed, moss, weed stems and grasses
Lining Material – usually not lined. With rootlets, moss.
Adhesive – usually not present. Mostly used to keep the nest stationary on the tree.
Example of birds: Dove, Ibis, some species of Loons and Gulls
3. Platform
General – typical among raptors and birds of wetland. Roughly built. Big enough for the parents to land on.
Main Material – sticks or twigs.
Lining Material – not present in most case. Grasses, small branches.
Adhesive – not present.
Examples of birds: Pigeon, Hawk, Falcon, Harrier, Kite, Heron
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MaterialBird uses certain type of material for various reasons: to strengthen
the nest structure, to provide cushion, and protection for their eggs and
young. Solid, durable materials such as “stick, twig” provide the lattice
structure for the nest. Thin, flexible materials such as “rootlet, grass,
bark” line the nest. Soft materials such as “feather, moss, leaves”
cushion the egg. In addition, Birds often put some human-made
objects
in their nest for no apparent reason.
Notably, some species of bird have the habit of adding “green
leaves or cedar bark with pesticidal properties” to their nests as the
sanitizer. This behavior is often spotted in species that reuse their old
nests.
Source: Paul R. Ehrlich, David S. Dobkin, and Darryl Wheye, The
Birder’s Handbook (Simon & Schuster: New York).
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White-tailed Kite
Image courtesy of the State of California.
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White-tailed Kite • Saucer-shaped nest
• Mainly constructed with willow
twig and weed stick.
• Lined with medium-sized bark.
• Thin, fine bark helps cushion
the interior, making it soft.
• Animal fur and pieces of rope
are found.
• Tiny twigs are put inside the
nest to prevent eggs from
rotating around.
Dimension: 23.8 x 28.2 x 8 cm3
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4 cm4 cm
23.8 cm23.8 cm
28.2 cm28.2 cm
White-Tailed Kite
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Eastern Kingbird
Image courtesy of the U.S. National Park Service.
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Eastern Kingbird
• Cup nest.
• Main structure is made of
flower twigs, which are soft
and flexible.
• Lined with rootlets and cotton.
• The interior is delicately
cushioned with the parents’
feathers and plant fiber.
• Black artificial strings are
found throughout the nest.
Dimension: 13 x 13 x 5.5 cm3
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4 cm4 cm
13 cm13 cm
13 cm13 cm
Eastern Kingbird
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Black-billed Cuckoo
Image courtesy of the U.S. National Park Service.
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Black-billed Cuckoo
• Platform style.
• Roughly built with twigs.
• Lined with leaves.
• Unsophisticated nest.
• Twigs provide structural strength
and leaves cushion the eggs.
Dimension: 11.5 x 10 x 2.8 cm3
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2.8 cm2.8 cm
11.5 cm11.5 cm
10 cm10 cm
Black-billed Cuckoo
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Green Heron
Image courtesy of the U.S.D.A. Forest Service.
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Frazer’s Green Heron
• A platform model.
• Entirely built with sticks.
• Eggs are locked in the middle.
• The selection of Y-shaped sticks with rough surface makes it easy to build this type of nest.
Dimension: 25 x 18.5 x 5.3 cm 3
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5.3 cm5.3 cm
18.5 cm18.5 cm
25 cm25 cm
Green Heron