When rabbits ate my Hostas last summer, I didn't look too closely for bite marks. I didn't see any, but that doesn't mean they weren't there.
What was notable and relevant to your question was that every stalk was cut off near ground level and the combination of leaf plus upper portion of the stalk was just left whole on the ground. At most one bite was taken through the bottom of each stalk. So many large plants were destroyed while only a tiny amount was eaten.
Around the same time, I also had deer eating Hostas and they eat a larger fraction of what they destroy. Between deer and rabbits, they destroyed 100% before I had time to buy any repellent. This year, I'm using a lot of repellent and so far nothing ate any Hostas.
My losses this spring:
I transplanted a lot of Campanula from scattered places where rabbits had ignored it to one spot near the front door and came out early the next morning to see a rabbit finishing it all off (totally eaten, no scraps left). I have sprayed repellent repeatedly on the small recovery those have made and nothing ate it again.
Viola I transplanted many years ago always gets eaten 80% or more. I never figured out by what (ground hog, insects, birds?). I used a lot of repellent and it made no difference. It was eaten even faster this year and never flowered at all. The same plant was thriving and flowering in the front lawn where nothing ever eats it (until it was slightly damaged by the weed-and-feed that I used this year first time ever, which fortunately did far more harm to dandelions and blue bugle, which were the dominant components of the "lawn").
I transplanted slightly rooted branches of Rhododendron to the back years ago, where in past winters deer would take all the leaves when the snow was just the right depth to suddenly make those appetizing. Nothing ever touches the giant Rhododendrons in front that those came from. Repellent or luck kept the deer from those this winter. Something has been gradually nibbling on those this spring, ultimately taking several whole leaves and parts of other leaves. Likely insects, but I'm not sure. Doesn't look like the way deer eat.
One or more rabbits ate several plants in the front garden that I never identified. More likely than not, I would have decided those were weeds if I had figured out what they were. One rabbit got very bold and just sat there eating while I was nearby. But I don't normally wear my glasses, hadn't yet done any work in the part of the garden the rabbit was eating in and never had any guess what it ate.
