Unplumb'd Menagerie or Don't Know Much About Biology

My sense of the Awhl remains "awhl"fully small.
What is known of the Brylle is, by all accounts, nil.

Me re the Clampoo...? Clueless (i.e., no clue). 
Daily probes of the Droone...? Discontinued last June.

Concerning the Ehrd one hears barely a word.
R&D on the Flopt...? Ex officio: stopp’d.

Shall I shelter a Glannz...? Though I should, I've no plans.
Once endanger’d, the Hyst now's been scratch’d from that list. 

The Ilkh has no ears. (Heaven knows how it hears.)
Sure, I pooh-pooh’d the Jang...once the Fat Lady sang.

This Klangel was born on my voy'ge 'round the Horn.
The Lhugee survives by ingesting its wives.

Asked to mother the Mahnks, I balk'd: "Thanks but no thanks."
How uniquel is the Nyuk...? It’s half dog and half duck.

People visit an Ong – but they don't tarry long. 
It's reported the Phryffe lives in fear for its life.

Have I seen a Qabaz...? Don't talk rot: no one has!
Tweets and blogs 'bout the Rholld...? Evidently on hold.

A life of the Schtook fills one very small book.
One knack of the Tyghte is to hide in plain sight.

The last living Uewe died in 2002.
Yes, the Vardavalette proves a petulant pet.

The Warg "went extinct" once folks noticed it slinked.
The Xanthano can catch the Gingerbread Man. 

This Yergaroo pair intermingles its hair.
The word is: the Zhazent would love to...but doesn't.