Bird anatomy is stupid and I don't mean in the literal sense I mean that they change so much by just stretching or scrunching a little or changing angles. They're like cats, it's horrifying.
Look at this budgie. Normal bird right? Not decieving you at all. Perfectly normal shaped bird.
For #WorldBudgieDay, here is the 1st published image of a Budgerigar (Melopsittacus undulatus) for its scientific description by George Shaw (as the “Undulated Parrakeet") in The Naturalist's Miscellany of 1804-5.
(Yes, it appears unnaturally elongated, likely due to Shaw working from a skin rather than a living bird.)