-plot(drop.tip(bird.orders, 6:23, subtree = TRUE), font = 1)
-plot(drop.tip(bird.orders, c(1:5, 20:23), subtree = TRUE), font = 1)
-
+plot(drop.tip(bird.orders, 6:23, subtree = TRUE))
+plot(drop.tip(bird.orders, c(1:5, 20:23), subtree = TRUE))
+plot(drop.tip(bird.orders, c(1:20, 23), subtree = TRUE))
+plot(drop.tip(bird.orders, c(1:20, 23), subtree = TRUE, rooted = FALSE))