North of the Pyrenees Mountains, the natterjack toad offers a good example of hibernation, passing the winter dug deep into sandy ground.
I expect this sentence to be like this:
North of the Pyrenees Mountains, the natterjack toad offers a good example of hibernation, passing the winter by digging deep into sandy ground.
1-Is my sentence correct?
2-Why does the author use dug in the sentence?
Source:
2- Amphibians (Last paragraph)
With telic verbs—verbs which designate an action which ends in a change of state or position—it is very common for the past-participle form to be employed as a locative adjunct meaning "in the attained state or position".
In this case dig in(to) has a telic sense: the toad digs a hole in the sandy ground with the goal of positioning itself at the bottom. When it has completed that activity, it is dug in. Exactly the same expression is often used of soldiers in trenches:
The troops spent a cold, pitiless Christmas dug in at Bastogne, until a successful counterattack turned back the German offensive. —source
Your rewrite is different: the present-participle form digging designates the activity of digging rather than the attained goal of the activity.
