SABAH, Malaysian Borneo - Do you know why the Rhinoceros Hornbill has a golden-yellow horn called casque on top of its beak? The casque which is made up of keratin acts as
Discovery on Instagram: "#DidYouKnow the "horn" of the Rhinoceros Hornbill is called a casque! Hollow and made of keratin, it amplifies the bird's calls. #Birds #ColorInNature"
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![By the Horns of Trioceros, the Casque of Calumma, the Brood of Bradypodion--Chameleons, Part 2 - Scientific American Blog Network By the Horns of Trioceros, the Casque of Calumma, the Brood of Bradypodion--Chameleons, Part 2 - Scientific American Blog Network](https://static.scientificamerican.com/blogs/cache/file/5D926B28-52CE-4AD5-B05DBE44FE574E35_source.jpg?w=590&h=800&809FAFDD-A48B-43BF-94CD2F80221FC9FC)
By the Horns of Trioceros, the Casque of Calumma, the Brood of Bradypodion--Chameleons, Part 2 - Scientific American Blog Network
![Rainforest Trust on X: "This unusual-looking bird is a Rhinoceros #Hornbill! Found in Southeast Asia, it gets its name from the bright horn-like structure on their head, called a casque. This casque Rainforest Trust on X: "This unusual-looking bird is a Rhinoceros #Hornbill! Found in Southeast Asia, it gets its name from the bright horn-like structure on their head, called a casque. This casque](https://pbs.twimg.com/media/EP4F11xW4AICRsK.jpg)
Rainforest Trust on X: "This unusual-looking bird is a Rhinoceros #Hornbill! Found in Southeast Asia, it gets its name from the bright horn-like structure on their head, called a casque. This casque
![Carnegie Museum of Natural History on X: "This species' colorful “horn” is called a casque, and acts like a megaphone to amplify the male bird's call. "馬來犀鳥 Rhinoceros Hornbill" by Hiyashi Haka Carnegie Museum of Natural History on X: "This species' colorful “horn” is called a casque, and acts like a megaphone to amplify the male bird's call. "馬來犀鳥 Rhinoceros Hornbill" by Hiyashi Haka](https://pbs.twimg.com/media/FYhIBrgXwAEvQky.jpg)
Carnegie Museum of Natural History on X: "This species' colorful “horn” is called a casque, and acts like a megaphone to amplify the male bird's call. "馬來犀鳥 Rhinoceros Hornbill" by Hiyashi Haka
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Phoenix Zoo - The rhinoceros hornbill gets its name from the hollow rhino horn-shaped casque on its beak. The casque is made of keratin (the same material as human fingernails) and amplifies
![Trumpeter hornbill (Ceratogymna bucinator) showing the large curved casque of horn on top of its bill. The horn is slightly smaller in females than in Stock Photo - Alamy Trumpeter hornbill (Ceratogymna bucinator) showing the large curved casque of horn on top of its bill. The horn is slightly smaller in females than in Stock Photo - Alamy](https://c8.alamy.com/comp/2ADP8G9/trumpeter-hornbill-ceratogymna-bucinator-showing-the-large-curved-casque-of-horn-on-top-of-its-bill-the-horn-is-slightly-smaller-in-females-than-in-2ADP8G9.jpg)
Trumpeter hornbill (Ceratogymna bucinator) showing the large curved casque of horn on top of its bill. The horn is slightly smaller in females than in Stock Photo - Alamy
![Southern cassowary close-up portrait. Australian double-wattled cassowary (Casuarius casuarius) is huge bird with blue skin on face and neck, two red wattles and horn-like brown casque on the head. Stock Photo Southern cassowary close-up portrait. Australian double-wattled cassowary (Casuarius casuarius) is huge bird with blue skin on face and neck, two red wattles and horn-like brown casque on the head. Stock Photo](https://as2.ftcdn.net/v2/jpg/02/37/79/41/1000_F_237794159_ZVVpetqK4yrPmQ8k0el5DSAPWuPWHqfh.jpg)