this post was submitted on 15 Dec 2025
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They're separate biological classes.
So they're about as far apart as you are from a reptile, bird or fish.
That would mean...not very. Reptiles are an extremely broad and diverse group, containing everything from penguins and crocodiles to tuataras and pythons. Mammals are the most closely-related extant clade that is generally not considered "reptile", to reptiles.
Arachnids, on the other hand, are more distantly related to insects. Crustaceans form their closest relatives, followed by myriapods (centipedes & millipedes). Only then do arachnids appear.
Reptiles, as traditionally defined and therefore as usually meant, do not include birds or mammals. It's a paraphyletic classification (of which there are boatloads).
Mammals, Birds and therefore non-mammal, non-bird amniotes (reptiles) are class-level classifications, as are insects and arachnids.
Sure, but we're having this conversation in 2025, after phylogenetic classification has long since taken over as the way we describe the relations between species.
Birds are unambiguously reptiles.
Mammals are not reptiles, but are the most closely-related animals to them.
Who is "we"? It certainly isn't most people. It's like these interminable "no such thing as a fish" bollocks. Or "AcKsHuAlLy bananas are berries OHOHOHOHO."
Keep that kind of jargon for your academic articles. In pop-sci contexts like here, it's not unreasonable to use, but it deserves a health warning because of the intersection of audiences. Insisting that there's only one correct usage is insufferable.
But bananas are berries. It's fun to learn things.
What underlying fact does that teach you? Only that botanists categorise fruits a certain way. Learning that word doesn't teach you anything about bananas, does it?
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Well, it taught me that berries have a strict botanical meaning rather than just being and cute little fruit on a bush, and that there can be multiple meanings for a word based on context. There's nothing wrong with calling a strawberry a berry even while understanding it's not really a berry. Correctness is important in formal discussions, but we can have fun being intentionally wrong in everyday speech where poetry and history hold more value.
From there one asks, "What is a berry? What about a banana makes it a berry? And what is a strawberry if not a berry?" And so one reads and one learns. "What about a raspberry? What about grapes?" The internet is as forthcoming with answers as one's brain is with questions.