Z + X

i'm not sure about these two?
they are wonderful symbols!
but as for them being letters in our alphabet?
i am not convinced
i was thinking about them yesterday
for some reason
and thought we could do without them
zebra
zoo
xylophone
i can't really think of any more words
zany
zilch
but really
i think we could do without them
and think of how much more important
the zebra would feel
to have a letter in his/her name
that doesn't actually exist