Disney's Fantasia (1940) and its sequel, Fantasia 2000, hold a special place in my heart as I've always felt sensorially and emotionally attached to these movies and it's always a treat to watch them despite the several inaccuraces and stereotypes of animals: in the Rite of Spring segment (beautiful composition by the way I highly suggest it) the first uni and pluricellular organisms are depicted as being already pretty advanced and fast in movements.
Then throughout the rest of the segment animals from all over the Mesozoic and earlier share the swampy surroundings and while some designs were pretty advanced and speculative for their times - for example the sail on Parasaurolophus and the colours on the pterosaurs' face - others were outright omissions of known knowledge, most infamously the 3-fingered hand of the Trex, but since one is not really "others", the pointy sails of what I can only speculate as being some mosasaurid and one of the pterosaurs hanging from the rock like a bat are others.
Then we have Dimetrodon eating fish in a swamp because it was still the 40s - and the same creature runs from the Trex with the herbivores in the chase scene, so flesh eater = bad but fish flesh eater ≠ bad I would say a stereotype - and during the same scene no sauropod ever thinks about stepping on the predator which is portrayed as a bloodthirsty ruler of these lands and conveniently never gets pierced by the Stegosaurus' spikes but only gently hit by the tail (thinking about it the animals do feel like they're made of rubber by never bleeding even in the case where there should 100% be blood).
I could go on just with the Rite of Spring but I'm going to move on for the sake of making the post not too tedious.
We have the 4 Seasons of Vivaldi in what I believe is the Summer segment, we have a fish with abnormally long and unnaturally transparent tail for the sake of giving it a provocative feminine aspect (while the protruding lips are not characteristic of the fish's species I'm confident, kissing gouramis do exist so just this time it's passable).
In Fantasia 2000, Pines of Rome, the whales are very expressive with their eye movements and even with slight smiles and grouches, at least on the pup, something that does not happen in real animals.
And despite their extreme intelligence, they have not mastered levitation.
The Carnival of Animals segment features a very cocky and anti-conformistic flamingo playing with a yo-yo in an array of leg movements not typical of flamingos that, unless you have noticed, make very bad players and suffer from stage embarrassment.
The Firebird Suite (also very good piece in my opinion) features a human-blue-eyed deer that does not run away from impending doom when its spring-personification friend is being chased by a lava phoenix.
The whole Donald Duck being Noah's assistant segment.
And in both movies, correct me if I'm mistaken, no Mouse should know magic.
Despite these inaccuraces, I enjoy these movies every time I see them because I'm very affectionate to them, they're a delight to both the eye and ear, I cannot recommend them more for some quality classical music animation.