How to punctuate lists that are nested to three levels?

A basic list is punctuated like this:

The park has some bears, deers, and other animals.

(bears) (deers) (other animals)

When commas appear inside the items of a list, or when lists appear inside other lists, I often see semi-colons used, e.g.:

The park has: some bears; many deers, which are quite friendly, like to eat camp food, and watch visitors; and other animals, most of which live in the trees.

(bears) (deers (friendly) (like to eat) (watch visitors)) (other animals (live in trees))

When semi-colons appear inside the items of a list, or when lists appear inside lists of other lists, what punctuation can be used?

(bears) (deers (friendly) (like to eat (popcorn) (marshmallows) (chips)) (watch visitors)) (other animals (live in (tall trees) (short trees))

Update:

To clarify, I am not looking for a way to reword the sentences. I am looking for a way to punctuate the lists in these situations.

Solution 1:

While not always appropriate, bulleted lists naturally take care of the nesting problem. In addition, they help individualize the reading experience by allowing the reader to drill down into interesting areas while skipping others.

The park has:

• bears
  • grizzlies, which number in the tens
    • Attacks are much rarer than the media would lead you to believe, but they do happen.
  • brown bears, which number in the thousands
• many deer, which are quite friendly, like to eat camp food, and watch visitors
• other animals, most of which live in the trees

Solution 2:

The park has some bears, many deer (which are quite friendly, like to eat camp food, and watch visitors) and other animals, most of which live in the trees.

Solution 3:

You end up with something like

The park has: some bears; many deer, like roe deer which are quite friendly, like to eat camp food, and watch visitors — also fallow deer which are timid; and other animals, most of which live in the trees.

That would work, but it's awkward and although a dash seems to work, you can really only have one of those and it's still very easy to get lost in the lists. I would separate the detail into another sentence. You can add further detail like this quite easily.

The park has: some bears; many deer; and other animals, most of which live in the trees. The park's roe deer are quite friendly, like to eat camp food and watch visitors; the fallow deer are quite timid. Tree-dwelling animals include chimpanzees, which can be quite fierce; and macaques, which are rarely seen at all.

I'm not sure about the last semi-colon in that example. (Oh, and I usually use deer.)