The study found that Troodons were warm-blooded animals with a reproductive system similar to today's reptiles, but they also had the ability to moderate their body temperature similar to birds.

Source: https://calgary.ctvnews.ca/dinosaur-species-laid-eggs-like-reptiles-brooded-like-birds-new-study-finds-1.6341691

Troodons represent the best example of this as they have all the makings of a perfect villainous dinosaur like the Spinosaurus and Giganotosaurus.

Source: https://www.cbr.com/jurassic-park-ignored-dinosaur-scarier-than-xenomorph/