Capybara
For the most part, capybaras are known to be one of the gentlest creatures on Earth, often leading to “unlikely animal pairings” between their species and others. However, these semi-aquatic rodents are capable of aggression and make bark-like noises when threatened. The species suffers from reproductive competition leading the dominant male to often commit infanticide to promote the well-being of their own offspring rather than their competitor’s.