Write a program that outputs the common names of five of the world's smallest known bird species. Your output should include the common name and size of each species. You can find this information by searching the web for something like "smallest bird species" $--$ please output the name of the source you used for your information as well. Make sure you use an authoritative source for your data. Note: Your program doesn't need to gather this information; instead, you may hardcode it into your program code.