I think that’s specific to mammals. Just off the top of my head…

Invertebrates? No. All out

Fish? No. Also a Hammerhead would’ve really sold this comic lol.

Birds? No. Though, even on the side they do often have a tilt toward frontal in a lot of predatory birds. It could be argued…

Reptiles? No.

Amphibians? No. There’s no even trying to place rules on that optical chaos.

Mammals? Yeah, pretty much. Can’t think of an outlier but I’m sure there’s plenty of obvious ones.

Edit’ Ah, there we go. Of course marine mammals are an exception. But back in land, as too are llamas. Makes you wonder…what are the llamas plotting?