Alexei Volkov
Toucans are known for their large beaks, which account for about a third of their body length and only about a twentieth of their mass. The beak is composed of a foamy interior and layers of fibrous keratin tiles on the outside. The inner beak is made of collagen foam, with a high glycine content and subsequent hardness, while the outer shell is made of overlapping, hexagonally-shaped thin plates of keratin protein held together by an organic glue. The foam is covered with keratin tiles, each about 50 micrometers in diameter and 1 micrometer thick. The purpose of the keratin shell is to act as a viscoelastic medium for dispersing severe impacts to the beak over a greater area, to reduce the effects of local imperfections, protecting it from cracking damage. The large beak serves multiple functions for the toucan, including thermoregulation, feeding, and defence. The beak's structure has inspired the development of ultra-light aircraft and vehicle components with synthetic foams made with metals and polymers. Additionally, 3D printing has been used to create prosthetic beaks for injured toucans, utilising durable, lightweight plastic.
| Characteristics | Values |
|---|---|
| Toucans' beak structure | Lightweight and strong |
| Inner beak | Rigid foamy inside, collagen foam, bony fibers, drum-like membranes, struts, collagen trabeculae |
| Outer beak | Layers of fibrous keratin tile outside, keratin shell, hexagonal scales, organic glue, styrene |
| Beak functions | Thermal regulator, tool in feeding, defense, attracting mates, grappling hook |
| Beak size | One-third of the bird's length, 40% of the bird's body surface area |
| Beak weight | 1/20th of the bird's mass |
| Beak density | 0.1 to 0.25 grams per cubic centimeter |
| Beak hardness | 0.22 ± 0.01 GPa, 0.48 ± 0.06 GPa |
| Beak strength | Tensile strength of 50 MPa, Young's modulus of 1.4 GPa |
| Calcium content | Higher in the foam than in the keratin shell |
| Crushing stress | 0.17 MPa |
| Keratin | Low sulfur content, lower cystine content |
| Microhardness | 0.28 ± 0.03 GPa |
| Nano-hardness | 0.55 ± 0.12 GPa |
| Beak replacement | 3D-printed durable, lightweight plastic |
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What You'll Learn
Toucans' beaks are made of a composite material with rigid foam inside
Toucans have an unusually large beak, which accounts for about forty percent of their total body surface area. Despite its size, the beak is lightweight, comprising only one-twentieth of the bird's mass. This is due to the beak's composition: a sandwich structure of keratin tiles on the outside and rigid foam inside.
The outer keratin shell is made up of overlapping, hexagonally-shaped thin plates of keratin protein, glued together by an organic glue. The hexagonal keratin cells have a diameter of around 50 micrometers and are about 1 micrometer thick. The purpose of the matrix of intermediate filaments within the shell is to act as a viscoelastic medium for dispersing severe impacts to the beak over a greater area, reducing the effects of local imperfections and protecting the beak from cracking damage.
The inner foam is made of a collagen foam with a high glycine content and subsequent hardness, similar to bones. The collagen trabeculae vary from 70 to 200 micrometers in thickness and are often hollow with an edge connectivity of 3 or above. Together with even thinner (2 to 25 micrometers) membranes, they form a closed-cell foam network, which provides optimal strength at low density, essential for flight. The membranes and trabeculae have a higher calcium mineralization content than the dense outer beak, making the inner collagen trabeculae stronger pound for pound than the outer shell.
The closed-cell structure of the foam offers greater energy absorption capacity and resistance to compression than open-celled structures. The rotational deformation of cell walls, stretching of membranes, and internal gas pressure all contribute to these features. The combination of the shell layer and foam-like interior gives the beak greater strength than the sum of the strengths of its individual parts. This synergistic effect has inspired the development of ultra-light aircraft and vehicle components with synthetic foams made with metals and polymers.
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The beak's exterior is made of fibrous keratin tiles
The toucan's beak is a marvel of nature, with its large size and considerable strength, yet it accounts for only one-twentieth of the bird's total mass. The secret to its lightweight strength lies in its unique structure. The exterior of the beak is made of fibrous keratin tiles, which form a protective shell. These keratin tiles are hexagonally-shaped thin plates, each about 50 micrometers in diameter and 1 micrometer thick. They are glued together with an organic glue to form sheets that cover the underlying foam-like structure.
The keratin shell exhibits remarkable properties due to its strain-rate sensitivity. At lower strain rates, the organic glue between the keratin scales slips, allowing for a certain degree of flexibility. However, at higher strain rates, the keratin scales themselves fracture, preventing the propagation of cracks and protecting the beak from catastrophic failure. This makes the toucan's beak exceptionally durable and resistant to damage.
The hexagonal structure of the keratin tiles also contributes to the beak's strength and stiffness. This design efficiently distributes impacts and stresses, ensuring that forces are absorbed and dissipated without causing breakage. The keratin shell acts as a protective barrier, enclosing the inner foam-like structure, which is composed of struts and thin protein membranes that enclose air spaces. This foam-like structure provides rigidity and strength while keeping the beak lightweight.
The keratin shell also plays a crucial role in thermoregulation. The toucan's beak serves as a thermal regulator for heat exchange, and the keratin shell helps in this process. The large surface area of the beak, combined with the properties of the keratin shell, allows the toucan to release heat through the beak, cooling down its body in warmer temperatures. This adaptation is particularly important for toucans as they are exposed to some of the warmest monthly temperatures among birds.
The toucan's beak is a remarkable example of nature's engineering prowess. The fibrous keratin tiles of the exterior provide strength, stiffness, and protection, while the underlying foam-like structure ensures lightweight durability. This combination allows the toucan to have a large, strong beak without compromising its ability to fly. The beak's structure has inspired engineers and designers, who hope to replicate its properties in various applications, including the development of ultra-light aircraft and improved crash resistance in vehicles.
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The beak's foam interior helps with thermoregulation
The toucan's beak is a technological marvel, serving several functional roles for the bird. Notably, the beak acts as a thermal regulator for heat exchange, aiding in thermoregulation. The beak's large surface area facilitates this process, as increasing blood flow to the beak cools the toucan down, similar to how panting cools a dog down.
The toucan's beak is composed of a collagen foam with a high glycine content, resulting in a hardness comparable to that of bones. This inner foam is a closed-cell foam network characterised by thin membranes and collagen trabeculae, providing optimal strength at a low density, which is crucial for the toucan's ability to fly. The collagen trabeculae vary in thickness from 70 to 200 micrometers and are often hollow, contributing to the beak's lightweight yet sturdy structure.
The foam interior of the toucan's beak plays a crucial role in thermoregulation. At warmer temperatures, the beak releases heat to cool the toucan's body, while in colder temperatures, the beak maintains the ambient temperature, allowing the bird to conserve metabolic heat. This is achieved through the constriction of vessels below the thermal neutral zone, helping to retain warmth within the body.
The unique structure of the beak, with its closed-cell foam interior, enhances the toucan's ability to regulate its body temperature. The foam's ability to quickly transfer heat, however, can be a liability in colder climates, which is why toucans often sleep with their beaks tucked beneath their wings to minimise heat loss. This behaviour further highlights the importance of the beak in the toucan's thermoregulatory strategies.
The toucan's beak, with its foam interior, is an excellent example of nature's engineering prowess. The synergistic effect of the hard outer shell and the foam-like interior creates a structure that is stronger and stiffer than the sum of its parts. This design has inspired engineers to develop ultra-light aircraft and vehicle components that can absorb high-energy impacts while maintaining low weight and high stiffness, demonstrating the practical applications of biomimicry in engineering and design.
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The beak's foam structure is strong yet lightweight
The toco toucan's beak is a marvel of evolution, with its large size and considerable strength, yet it comprises only one-twentieth of the bird's total mass. The secret to the toucan beak's lightweight strength is its unusual bio-composite structure. The interior of the beak is a rigid foam made of collagen with a high glycine content, similar to bones, and drum-like membranes. This closed-cell foam network provides optimal strength at low density, which is essential for the toucan's ability to fly. The foam is composed of struts and thin protein membranes that enclose variably shaped air spaces, forming a highly organised matrix of stiff cancellous bone fibres.
The foam's relative density was found to be 0.09, and its mean crushing stress value is 0.17 MPa. The calcium content is higher in the foam than in the keratin shell, increasing its hardness. The keratin shell, with its hexagonal structure, provides further strength and protection from cracking damage. The purpose of the matrix of intermediate filaments within the keratin shell is to act as a viscoelastic medium, dispersing severe impacts over a greater area to protect the beak from cracking.
The synergistic effect of the shell layer and foam-like interior gives the beak greater strength than the sum of its parts. This composite material design offers principles that can be applied to develop ultra-light and highly stiff and strong materials. For example, synthetic foams made with metals and polymers could be used to create ultra-light aircraft and vehicle components with improved crash resistance.
The toucan's beak serves multiple functions, including thermoregulation, feeding, and defence. Its large surface area aids in cooling the bird down, similar to how panting cools a dog. The beak is also used to obtain food, such as snaggling slippery fruits, and as a tool for defence against predators.
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3D-printed plastic can be used to replace a toucan's beak
A toucan's beak is an essential part of its body, used for foraging, defence, thermoregulation, feeding, and mating rituals. The beak is composed of minimal struts of bones filled with spongy keratin, making it both strong and lightweight. This unique structure has inspired the development of ultra-light aircraft and vehicle components.
Unfortunately, toucans are sometimes the victims of brutal assaults, which can result in the loss of their beaks. This was the case for Grecia, a Costa Rican Black-Mandibled Toucan, who lost most of his upper beak in an attack by a group of children. Such an injury usually results in a death sentence for the bird, as a toucan cannot survive without its beak.
However, advancements in technology have provided a possible solution for Grecia in the form of 3D-printed plastic prosthetics. 3D-printed animal prosthetics have been used before, mostly for dogs, and for eagles, which have smaller beaks that are less complex than a toucan's. Nonetheless, ZooAve Rescue and OrthoPets, a veterinary prosthetics company, are collaborating to create a custom-designed replacement beak for Grecia made out of durable, lightweight plastic. This new beak will be attached to Grecia's lower mandible using screws and tongues and is expected to last him the rest of his life.
The use of 3D-printed plastic to replace a toucan's beak is a groundbreaking development, offering a second chance at life for these birds. It is a complex process that requires precise weight and flexibility considerations to ensure the prosthetic functions as intended. This innovative application of 3D printing technology showcases the potential for further advancements in veterinary medicine and prosthetics.
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Frequently asked questions
You can sculpt a beak out of blue foam insulation or the foam sold through a taxidermy website for fish mounting. Cover the foam in tin foil, then use Thermo Plastic to mould the beak shape.
Cut the mouth plates out of a plastic called "styrene", available at local sign shops in several thicknesses. You can also use a product called "chloroplast", which is a heavy-duty version of cardboard made completely of plastic.
The foam interior of a toucan's beak is lightweight and strong, with a closed-cell structure that offers a more complex energy absorption capacity and resistance to compression. The foam also helps with thermoregulation, acting as a thermal regulator for heat exchange.
Plastic can be used to create a lightweight and durable toucan beak. A 3D-printed plastic beak can be used as a prosthetic for a toucan that has lost its beak, giving it a second chance at life.
