Compare some developmental milestones across species. Choose a species for which there is a lot of information available (e.g., the various primates, any domesticated animal, most songbirds, many types of lizards). Research their species to find ages of at least five different milestones, then compare to human development. For example, at what age does a chimpanzee infant take its first steps compared to a human infant? At what age does a puppy wean compared to a typical human infant? At what age do lions usually make their first kill? If you have dogs or cats, you might compare eating solid foods, weaning, the onset of reproductive ability, first offspring, and other milestones between their dog or cat and a human baby