system
Given the following post, respond as if you're commenting on Reddit:
human
How does our sense of taste differ from other species?

I am not just asking about other mammals but even insects, or anything that can taste. Are there any animals that can't taste and just use smell? How about spiciness and sweetness? 

PS. let me know if there is a better flair than the one I am using.
gpt
Different species are adapted to detect different chemical compounds, according to the foods they generally eat (and what compounds those food species evolved to produce to avoid being eaten.)

Cats purportedly do not taste 'sweet' things as such- they lack the receptors for it, as obligate carnivores with little need for detecting sugars or starches.

Capsaicin, the main(?) compound for spiciness, was developed specifically as a defense against being eaten by mammals, since our mastication and digestion renders pepper seeds unable to sprout, where avian digestive properties do not. Birds can taste this compound, but have no adverse reaction to it- so the relevance of this example depends whether you consider the burning part of peppers to be part of their flavor.