1. Greater sage grouse
This North American bird inflates its chest and preforms a bizarre dance to attract females.
2. Siamang gibbons
The largest species of gibbon can inflate its throat to amplify its booming calls.
3. Magnificent frigatebird
Male frigatebirds inflate their throat sac ready for inspection by nearby females.
4. Puffer fish
These fish fill their spined bodies with water to stop predators from getting a good enough grip.
5. Hooded seal
Males inflate a dangling sac as part of an aggressive display to scare away other seals.
Image from flickr.com/photos/floridabirds