Dinosaurs are related to modern animals.
Dinosaur behavior . Interpretations of dinosaur behavior are generally based on the pose of body fossils and their habitat , computer simulations of their biomechanics , and comparisons with modern animals in similar ecological niches . Feathered dinosaur . In fact , birds are now believed to have descended directly from the theropod group of dinosaurs , and are thus classified as dinosaurs themselves , meaning that any modern bird can be considered a feathered dinosaur , since all modern birds possess feathers ( with the exception of a few artificially selected chickens ) .