sinjabu fu'ivla

x₁ is a squirrel of genus/species x₂

Any member of Sciuridae, including some that live on or under the ground. See also ricyratcu, marmota, ronte, egnama, mabru.

lensisku

In notes:

ronte: x₁ is a rodent [can be a member of eutherian mammal Rodentia; semantic broadening might subjectively generalize the concept somewhat] of subtaxon/type/genus/species/breed/variety x₂.
rusysinjabu: x₁ is a grey squirrel of (sub)species/breed x₂.
xunysinjabu: x₁ is a red squirrel of (sub)species/breed x₂.