I'm not done reading this yet. Since it's so long, I'll give feedback in parts.
"it has the intuition" Instinct, you mean?
"parental instincts" Do the Seashrogs look like infant Wolvershrogs?
"Fully aware are a different species" I wonder if animals can even recognize "natural kinds", much less species...do cats know that they are cats and humans are humans, or do they consider humans weird cats or "those big two-legged things"? I recommend rephrasing it to "they are aware of the big physical differences between them" or "aware that they are reproductively incompatible", if the latter can be assumed a proxy for species recognition...and I'm not sure whether that counts.
"beams also serve to support additional floors, shelves, and various ramps" That seems rather sophisticated architecture. Great apes are highly intelligent and regularly create fairly sophisticated nests; judging by Wikipedia, the closest parallel to the Wolvershrog's architecture may be how orangutans may add "pillows", "blankets", "roofs", and "bunk-beds" to their nests.
Since the "furniture" may lead one to conclude they're sapient, I recommend relating them to orangutans in the description.
" Wolvershrog has borrowed ideas from the Maineiac Rivershrog" I don't think they can communicate. Did it simply observe them making nests and eventually imitated them? Certainly, animals can imitate other animals, but borrowing nest-building "ideas" seems rather complex.
"due to their close relation" Using it as a noun suggests they have a cousin between them or something of that sort. I suggest, "due to being closely related".
Wow, that's a long description...it's about 500 words longr than for the Pollooks genus group, though substantially shorter than for the Seashrog.
I recommend splitting this into subheadings, like I did for the Pollooks and you did for the Seashrog.
This post has been edited by Coolsteph: Mar 30 2021, 09:08 PM