The dinosaur with the biggest brain relative to its body size is believed to be the Troodon. This small, bird-like dinosaur lived during the Late Cretaceous period and had a relatively large brain when compared to its body size, much like modern birds.
Troodon’s brain is estimated to have weighed about 50 grams and was highly developed, especially in areas related to vision and coordination. This suggests that Troodon was likely very intelligent compared to other dinosaurs, capable of complex behaviors and problem-solving skills.
However, if we consider absolute brain size without regard to body size, some larger dinosaurs, like the Argentinosaurus or Brachiosaurus, would have had much larger brains in terms of volume. Still, their massive size demands a less complex brain compared to smaller dinosaurs like Troodon. Ultimately, within the context of brain-to-body ratio, Troodon stands out as the most