Monkey Haven - Siamangs have a throat sac (also called a gular sac) which they can inflate to be about the size of their head. This sac makes their calls louder! Both
![Siamangs have large gular sac (throat pouch) that can be inflated to the size of its head, allowing it to make loud, resonating calls or songs : r/Awwducational Siamangs have large gular sac (throat pouch) that can be inflated to the size of its head, allowing it to make loud, resonating calls or songs : r/Awwducational](https://external-preview.redd.it/a9y2y9MQdHj-U-f1qnlhugNSc-BnZ483wEB00vhIwic.png?width=640&crop=smart&format=pjpg&auto=webp&s=892d0db2546aaa74cf21223e88d4ca8f5f83185f)
Siamangs have large gular sac (throat pouch) that can be inflated to the size of its head, allowing it to make loud, resonating calls or songs : r/Awwducational
![Magnificent frigatebird, fregata magnificens, is a big black seabird with a characteristic red gular sac. male frigate bird | CanStock Magnificent frigatebird, fregata magnificens, is a big black seabird with a characteristic red gular sac. male frigate bird | CanStock](https://cdn.w600.comps.canstockphoto.com/magnificent-frigatebird-fregata-picture_csp91092079.jpg)
Magnificent frigatebird, fregata magnificens, is a big black seabird with a characteristic red gular sac. male frigate bird | CanStock
![Male Magnificent Frigatebird (Fregata Magnificens) With Inflated Gular Sac On North Seymour Island, Galapagos National Park, Ecuador Stock Photo, Picture And Royalty Free Image. Image 57583681. Male Magnificent Frigatebird (Fregata Magnificens) With Inflated Gular Sac On North Seymour Island, Galapagos National Park, Ecuador Stock Photo, Picture And Royalty Free Image. Image 57583681.](https://previews.123rf.com/images/donyanedomam/donyanedomam1604/donyanedomam160400387/57583681-male-magnificent-frigatebird-fregata-magnificens-with-inflated-gular-sac-on-north-seymour-island.jpg)
Male Magnificent Frigatebird (Fregata Magnificens) With Inflated Gular Sac On North Seymour Island, Galapagos National Park, Ecuador Stock Photo, Picture And Royalty Free Image. Image 57583681.
![Frigatebird on Galapagos islands. Magnificent Frigate-bird on North Seymour Island, The Galapagos Islands. Male frigate bird with inflated red neck gular pouch (thoat sac) attracting females. Photos | Adobe Stock Frigatebird on Galapagos islands. Magnificent Frigate-bird on North Seymour Island, The Galapagos Islands. Male frigate bird with inflated red neck gular pouch (thoat sac) attracting females. Photos | Adobe Stock](https://as2.ftcdn.net/v2/jpg/02/00/94/21/1000_F_200942104_TbhkDjacUEBr4VWnYu2NWcBd69Cxfway.jpg)
Frigatebird on Galapagos islands. Magnificent Frigate-bird on North Seymour Island, The Galapagos Islands. Male frigate bird with inflated red neck gular pouch (thoat sac) attracting females. Photos | Adobe Stock
![Nest with magnificent frigatebird, one of them a female with her characteristic striking red gular sac 17653445 Stock Photo at Vecteezy Nest with magnificent frigatebird, one of them a female with her characteristic striking red gular sac 17653445 Stock Photo at Vecteezy](https://static.vecteezy.com/system/resources/previews/017/653/445/large_2x/nest-with-magnificent-frigatebird-one-of-them-a-female-with-her-characteristic-striking-red-gular-sac-free-photo.jpg)
Nest with magnificent frigatebird, one of them a female with her characteristic striking red gular sac 17653445 Stock Photo at Vecteezy
![Male Magnificent Frigatebird with Inflated Gular Sac on North Se Stock Image - Image of american, bird: 64605493 Male Magnificent Frigatebird with Inflated Gular Sac on North Se Stock Image - Image of american, bird: 64605493](https://thumbs.dreamstime.com/z/male-magnificent-frigatebird-inflated-gular-sac-north-se-fregata-magnificens-seymour-island-galapagos-national-park-64605493.jpg)
Male Magnificent Frigatebird with Inflated Gular Sac on North Se Stock Image - Image of american, bird: 64605493
![Male Magnificent Frigatebird With Inflated Gular Sac On North Se Stock Photo - Download Image Now - iStock Male Magnificent Frigatebird With Inflated Gular Sac On North Se Stock Photo - Download Image Now - iStock](https://media.istockphoto.com/id/506850692/photo/male-magnificent-frigatebird-with-inflated-gular-sac-on-north-se.jpg?s=1024x1024&w=is&k=20&c=eQ02oETGaIRlVHYQ83XM70u3rMVMAVk-dz9BPicWyXc=)