das Eichhörnchen
squirrel
A small rodent that lives in trees, has a bushy tail, and feeds mainly on nuts and seeds.
Ein flinkes Eichhörnchen kletterte den Baumstamm hinauf.
A nimble squirrel climbed up the tree trunk.

squirrel
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squirrel
A small rodent that lives in trees, has a bushy tail, and feeds mainly on nuts and seeds.
Ein flinkes Eichhörnchen kletterte den Baumstamm hinauf.
A nimble squirrel climbed up the tree trunk.

The word is made up of 'Eich-' (from 'Eiche', the oak tree) and 'Hörnchen' (little horn/croissant-shaped thing). So it describes a small animal that is often found in oak trees.
Das Eichhörnchen sprang von einem Ast der alten Eiche.
The squirrel jumped from a branch of the old oak.
The ending '-chen' is a diminutive form. Words with this ending are always neuter (they take the article 'das') and describe something small or cute.
Im Park saß ein kleines Eichhörnchen und aß eine Nuss.
A small squirrel sat in the park and ate a nut.
Typical verbs that describe the movements of a squirrel are 'klettern' (to climb), 'springen' (to jump), 'huschen' (to scurry), or 'flitzen' (to dart). A typical activity is 'Nüsse sammeln' (to collect nuts) or 'Nüsse verstecken' (to hide nuts).
Wir sahen ein Eichhörnchen, das flink den Baumstamm hinaufhuschte.
We saw a squirrel that quickly scurried up the tree trunk.
squirrel
'das Eichhörnchen' and 'das Eichhorn' mean the same animal: a small rodent that often lives in trees and has a bushy tail. In everyday language, people usually say 'Eichhörnchen'. 'Eichhorn' is also correct, but it is somewhat less common and can sound a bit more elevated or old-fashioned in some texts. If you are talking about the animal in a park or garden, 'Eichhörnchen' is usually the more natural choice.

Mein Vater sieht am Morgen ein Eichhörnchen im Garten.
My father sees a squirrel in the garden in the morning.
Auf dem alten Bild sitzt ein Eichhorn auf einem Ast.
In the old picture, a squirrel is sitting on a branch.