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:

Fish   Fowl   Mammal   Insect

The specific dichotomous key used here is pretty complicated.  It contains many characteristics of the different kinds of animals, and so it’s possible to have many more groups than just the ones above.  The key is set up in such a way that the groups are like top-level groupings, and when you further break things down, you find more and more of the characteristics.  Eventually you end up with “animals” or “organisms”, which is the smallest top-level category.
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
No problem!
assistant
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:

Fish   Fowl   Mammal   Insect

The specific dichotomous key used here is pretty complicated.  It contains many characteristics of the different kinds of animals, and so it’s possible to have many more groups than just the ones above.  The key is set up in such a way that the groups are like top-level groupings, and when you further break things down, you find more and more of the characteristics.  Eventually you end up with “animals” or “organisms”, which is the smallest top-level category.
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
You’re very welcome.  If you want to know more about any particular animal, you can ask for an introduction to them by typing their name followed by “introduction”, for example, “cow introduction”.
assistant
Can you explain to me what a dichotomous key is and how its used for animals?