You can also carry five samples from each animal, so you can collect them without having to make trips to Harriet every few animals like you do with the Trader Role.
The role is fun because it makes you stop and search for animals you would normally ignore. It revolves around sedating critters and selling the samples back to Harriet, an eccentric conservationist and drug maker.
The Naturalist role is great if you want to earn some easy money without having to slaughter countless animals.