Bayesian phylogenetics is a method used to figure out how different species are related based on their genetic information. Some scientists thought this method was really good at solving these relationships, especially for mammals and plants. However, new research shows that the results from this method might be too confident or optimistic. When using a computer simulation, it was found that the results from Bayesian analysis can be too optimistic when looking at gene sequences from multiple sources. On the other hand, other methods like neighbor-joining and maximum likelihood analyses are more cautious in their results. This means that the relationships between mammals and plants might not be as clear as previously thought.