We've been asked to do a markless exercice which consists in answering a question.
The question is « What is the function and symbolism of the stuffed animals in "The Natural History Museum" ?»
I would have answered that question if my dictionary had allowed me to clearly understand this poem (what is the reason of my presence here

Some passage, a lot of in reality stay opaque and vague to me... Woud you please help me to undestand.
Here is the poem:
They are glassed an boxed like childhood,
The dead creatures in their pastoral dance:
Grinning fox with native squirrel,
Ferrets in a stiff quadrille. Parents nod
And watch their children watch bloodshed
Always about to happen: the wee mouse
Crouch; the wildcat locked in pointless
Hunch. For Bosch, the first cat padded
Into pallid Eden with a small beast
Limp in is mouth. A child smiles. Her father
Aims a camera. He clicks, and does not ask
What the half-silvered hare asserts,
Shot on the cusp of change, forever
Almost escaping, kicking his heels at the dark
And here is what I've written abut it: The stiffed animals look absurdly frozen in an odd posture: The fox is smiling with a squirrel; the mouse is crouched. They do not look like real animals and they are out of the time.
These animals seem to be there to entertain the human beings. They are subjected, dominated as well as admired by the visitors as if animals had disappeared.
In red and green are the two passages I can't actually deal with.
Another grammatical question: why is there no -es added to crouch in the wee mouse crouch
and also, what does the cusp of change mean? I can't find an explination in any of my dictionaries.
Many thanks all,

Damiro