While most animals have a difficult time swallowing their food when they are held upside down, there is one animal that cannot swallow when held in this manner. This animal is a chicken.
No, bats, and other mammals can drink upside down too.
opossum
Crows are very intelligent creatures, and enjoy testing their limits, especially in regards to humans. However, they cannot fly upside down.
Sloth
why are aligator upside down in the video
Yes
Peristalsis and esophgeal musclulature.
You turn Upside down.
A flamingo eats with its head upside down.
Bats
No, bats, and other mammals can drink upside down too.
sloth
Humans don't need gravity to swallow, although, interestingly, birds (i.e. canaries) do.
Peristalsis or muscles in your esophagus contract in a wave pushing the water to your stomach
This would follow the same principal as swallowing when your upside down. Because humans swallow because of muscles in the pharynx and esophagus, not because of gravity, it must possible to choke when you are upside down.
A flamingo, they do this because of a filter in their mouths. this filter enables them to eat underwater without swallowing water. Its upside down though so they eat upside down
One of the animals that sleeps upside down is the opossum. There are over 40 different species of the opossum.