Your Theobromine/Chocolate-reference made me think about another option.
Appearantly Chocolate is quite toxic to dogs. Perhaps to more canines?
What if a small herbivore, being a prey for canines, ate alot of Cacao leaves &/or seeds?
Would it contain enough of Cacao's alkaloids/actives to essentially make these herbivores toxic to Canines?
Bird eats & spreads Cacao seeds & as a reward becomes Toxic to the predators that often hunt them? Sounds symbiotic.
Could DMT have such an effect too? Giraffes are known to be particulairly fond of Acacia foliage. What predators are
the most common threat to giraffes? Lions? Hyenas? How would these predators respond to orally ingested DMT? I can only
imagine that, eating such amounts of Acacia foliage all day, the Giraffe's flesh must be loaded with DMT and/or metabolites. Some african tribe is known to hunt for giraffe to produce an entheogenic brew from it's liver & bone-marrow. Could the lever & bonemarrow contain DMT or metabolites & could these be toxic to hyenas or Lions? Lions & Hyenas might learn to avoid Giraffes if they consistently get poisoned from eating their flesh.
Just another idea to consider.
More to consider:
Wikipedia said:
Pests
In Australia, Acacia species are sometimes used as food plants by the larvae of hepialid moths of the genus Aenetus including A. ligniveren. These burrow horizontally into the trunk then vertically down. Other Lepidoptera larvae which have been recorded feeding on Acacia include Brown-tail, Endoclita malabaricus and Turnip Moth. The leaf-mining larvae of some bucculatricid moths also feed on Acacia: Bucculatrix agilis feeds exclusively on Acacia horrida and Bucculatrix flexuosa feeds exclusively on Acacia nilotica.
Acacias contain a number of organic compounds that defend them from pests and grazing animals.[10]
Another thing is that many DMT containing plants are Legumes. Which are known to be nitrogen fixing; filtering nitrogen out of the air and putting it into the soil. Does DMT, like all tryptamines, not contain a Nitrogen atom?
Perhaps DMT could be an intermediary in the process of bringing the nitrogen absorbed from the air down to the roots & into the soil? So many things to consider.