Many species arise from evolution, but as in many fantasy works the creatures are created by gods, titans or something similar, so I think this gives a certain freedom to create creatures with fantastic characteristics, but that are scientifically plausible. Thinking about it, I would like to know: can a bird produce saliva that makes plants grow and wounds heal(even if for this there have to be two species, one producing healing saliva and the other producing saliva that stimulates plant growth)?
Details about the animal:
It is a species of bird that lives in forests, it feeds on fruits and grains that it gets from plants. Saliva is able to accelerate the wound healing process and even improve the immune system against diseases, viruses, bacteria, etc. They use this in case another member of the species gets hurt, then one opens its beak and lets the saliva run over the wound or if a member of the species gets sick, then they make it ingest the saliva of another to recover faster. This property has an effect on animals of other species as well as humans, making their domestication desirable. Another property is to make the seeds and plants that come into contact with your saliva grow faster. They use this to plant their own food (just like ants do with fungi) when they get the chance, let them salivate on the plant even after germinating to continue accelerating its growth. The effects of saliva are not immediate, it will not take seconds or minutes for plants to grow, wounds to heal and diseases to heal, it will just take less time than usual. Example: if a plant takes 9 months to grow to bear fruit, with the bird's saliva it would take 7 or 6, maybe even less. Ah, I don't know if that's going to matter, but the bird, when its wings are closed, is the size of a cat. I don't know if the size of the bird will matter in any way, but there you have it.