Can you explain to me what a dichotomous key is and how its used for animals?
Can you explain to me what a dichotomous key is and how its used for animals?
user
A dichotomous key is a way to arrange items, in this case animals, into a small number of groups.  So, in dichotomous keys, some animals are in one group and some are in another, like:
assistant
Great. I get it. So say you asked, does it have fur? That would help you distinct if its a mammal or a bird or a reptile, etc?
user
Yes, it is also used to distinguish between things like “fur” and “feathers” which also distinguish “mammal” and “bird” groups.  One way to distinguish those is to have a characteristic (like fur or feathers) that’s found in some mammals but not in birds, and a characteristic that’s found in some birds but not in mammals.  Another way is to have two characteristics (like fur and wings) that are each characteristic of the same group (birds) and of the same opposite group (mammals), and a characteristic that’s characteristic of only one group (like claws, or, in mammals, being covered in fur).
assistant
Great! Thanks for your help
user