voltolka'ecpi lujvo

x1 is a bird which is essentially incapable of sustained flight, of taxon x2

For birds which, consequently, primarily walk, see also: dzucpi; this word refers to a superclass thereof.

In notes:

dzucpi
x1 = d1 = c1 is a member of the class of birds which walk/run/hop as their characteristic/primary form of locomotion, of species/taxon x2 = c2