Show birthdays on calendar?

Show birthdays on calendar?

I have added a few contacts and added birthdays. I have also added ZohoCRM to my calendar. I have other items showing up on the calendar from the CRM but I do not see birthdays.

Is there a way to get birthdays to show up? I'd hate to have to add them to the contact then have to add them to the calendar. Seems counter-intuitive.

Thank you!