Mice are very nervous and scared animals. They also shake because their heartrate very fast.
The best age to start handling baby mice is four to five weeks.
In a quiver with a cover
If you are talking about the thing that you use to get the arrows out of while you are shooting, then that is called a quiver... If you are talking about the thing that you use to keep your arrows safe, then it is what it sounds like- an arrow case
quiver
An adjective for the noun quiver could be violent--a violent quiver.
The word quiver is the collective noun for a quiver of arrows.
Quiver
The collective nouns for arrows a 'sheaf of arrows' or a 'quiver of arrows'.
The bag that carries arrows is typically called a quiver. It is used by archers to conveniently hold and transport their arrows while practicing or competing in archery.
quiver (case for holding arrows)
A group of cobras is called a quiver
The arrows were stored in a quiver.