saliva secretion

Kisses are always considered one of the most meaningful gifts that couples want to give each other every day.

Not only did they kill their partners and cut off their genitals, Darwin's bark spider in Madagascar also had a salivary behavior at their children during mating.

Saliva is an internal fluid secreted from the salivary glands, which plays an important role in digestion. However, excessive salivation in some cases may be abnormal.