In fact, the only real reaction might be an allergic reaction to the mostly defensive secretions of daddy long legs. Pigs don't sweat at all because they don't have sweat glands. This is why pigs like to roll around in mud wallows, it helps to cool them off. It's funny how sayings can get started which are actually completely false. I am doing a science project on can air and water occupy the same space.
Fish actually breathe oxygen dissolved in water.
A good example of gas dissolved in a liquid is a bottle of pop. When you open it up the CO 2 gas dissolved in it starts to fizz out, yumm. There are about 4450 species of mammals. I've read that it needs to be kept warm, though. Animals without vertebrae, or backbones, are called invertebrates.