This. Is . Spam. from a fake account. So easy to do on the iNat forum!
My mother thought grebes and coots were ducks
Grebes are actually more related to flamingos than ducks!
And coots are more related to rails
Cetaceans are fish. I also heard seals are fish from an adult once. A bug is a specific group within insects called hemiptera but many use it to mean arthropods in general. Pteranodons and mosasaurs are dinosaurs because they are extinct reptiles.
Fish is a very overloaded word but I that that in sensu strictissimo it is quite clear that it refers to Pisces in the paraphyletic sense (excl. Amphibia, Reptilia,…).
Box turtles have a hinged part to their shell which enables them to close the shell up. It is a little like a box I guess.
There are a couple of different groups of turtles called box turtles: Terrapene in North America and Cuora in Asia. In different families but similar in having a hinged plastron.
I don’t know if this would count, but when my mother was a nurse, she cared for a woman who truly believed unicorns were real but had been hunted to extinction! Other than that, the most common errors I saw when I was a UTA were thinking mushrooms were a type of plant, and thinking slime molds were a type of fungus. As far as specific errors go, everyone Systematic Botany class mistook Luetkea pectinata for a saxifrage, but I’d consider that a more advanced mistake.