Non-harmful uses for animals

Long story short, various cultures in my world have religious taboos against harming one or more particular animals. However, where possible I would still like those peoples to be able to extract some value from their favoured animals, forming a cooperative relationship.

Some examples I've got so far: Horses and other large animals can be used as mounts or beasts of burden; sheep can give wool and milk; honey can be harvested from bees; dogs can be used in hunting, herding, tracking, and as guards; unfertilised eggs can be collected from birds, and they can also be used as messengers.

But I'm sure there are possibilities I've neglected, and so I turn to you folks. The animals of my world are a little smarter and stronger than we know on Earth, so don't be afraid to lean towards the outlandish.

Thank you for your time