hehehe..I never worked for Hudson's Bay Company
I hat..disaprove of the use of fur.But I do eat meat and have many leather products so I'm not out there hugging trees and eating granola
Nothing more horrible than scenes of Canada's once large seal fur industry.Sad thing is,fur is coming back again
to the original question:hides is trading commodity.When you build a caravan,you choose which commodity it will carry.In your city screen you should see a "demands" and "supplies",each listing 3 different commodities after.Demands is what your city wants.Supplies are what the city can build.Delivering camels gives 3 desirable effects:
1.One time gold bonus
2.One time science bonus equal in beakers to the amount of gold
3.longterm ongoing trade routes which add trade arrows to a city
The one time bonus is governed by many factors,one of which is whether a city demands that commodity or not.Demanded good bring in larger bonus".So if you see a city de4manding hides and one or more of your cities supplies hides,then build a hides caravan and deliver it to the demanding city.
Food caravans are more or less to be stored up when a city can not build any trading commodities.These can be used to build wonders or spaceship parts.Or they can used to swell cities populations well beyond what normal food levels will allow..but thats another topic.