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If you search the hashtag, #phylomoji, in twitter, you can find many creative phylogenetic tree constructed with emoji.

Now with ggtree, you can play #phylomoji in R.

Newick tree text can be constructed with emoji directly in R, and we can parse the text and visualize it with only one single line of code.

?View Code RSPLUS
 1 2 3  require(colorspace) require(ggtree) ggtree(read.tree(text=tree_text)) + geom_tiplab(color=rainbow_hcl(4))

Have fun with ggtree.

Note: In debian-based Linux, emoji works fine in both R console and plot if ttf-ancient-fonts was installed. In OS X, Apple Color Emoji.ttf works fine in R console, but not in R plotting. The figure posted in my tweet used OpenSansEmoji font.