The "bird-from-dinosaur" theory is one of the most widely accepted and well-supported theories in evolutionary biology. It proposes that birds evolved from a group of feathered dinosaurs called theropods during the Late Jurassic period, around 150 million years ago. This theory is based on extensive fossil evidence, anatomical similarities, and genetic studies.

A study that challenges this theory and proposes the opposite scenario, suggesting that dinosaurs evolved from birds, would face significant scrutiny and require compelling evidence to overturn the vast body of scientific knowledge supporting the current understanding of avian and dinosaurian evolution. Such a study would need to provide robust fossil evidence, molecular data, and phylogenetic analyses to support its hypothesis and challenge the existing paradigm.

The scientific community continuously evaluates and examines new findings, but any claim contradicting well-established theories requires extraordinary evidence and rigorous scientific validation before being widely accepted. Challenging a widely accepted theory requires careful consideration, reproducibility, and peer review before it can be considered as potentially changing the current understanding of evolutionary relationships between birds and dinosaurs.