Today, here in Germany, we celebrate “Tag des Baumes” (Arbor day). Arbor Day originated in Nebraska, United States and is celebrated in a number of countries, at different times. It is a holiday in which individuals and groups are encouraged to plant trees.
I found the above Hausa drawing at the website of the UCLA Language Materials Project. More like that can be found there.
Check out my Hausa link list at Delicious.