When Shuka was leaving Vyasa, Vyasa cried "O my son" to which it is said that trees animals replied Vyasa Statement given in Srimad Bhagavatham from https://vedabase.io/en/library/sb/
Vyāsadeva, fearing separation from him, cried out, “O my son!” Indeed, only the trees, which were absorbed in the same feelings of separation, echoed in response to the begrieved father.
Here it is said that trees echoed for also they were sad from separation from Shuka,
But The story I have been told in an Upanyasam was that the trees, animals all replied "yes" as they all considered themselves equal to Shuka ( Shuka always saw everyone equally, he also saw God in them ) What was the true emotion behind the reply
I don't know Sanskrit, so the Slokha also its meaning if provided would be great!!