with a little luck, a unicode character exists for your darwinian fish.
draw it and find out!
edit: i like it
. but due to its complexity, i doubt there'll be a unicode character for it.
font management looks in all fonts available on the system until it finds the character requested.
that's why your char displays although it is not contained in the current system font.
this is beyond including the character in an email, but if a unicode character does not exist, youmight want to look at various symbol fonts (old windows' *dings, or fontawesome and the like for modern webdesign)