• Biur Hakra – The meaning of the Shir of individual Animal said, the commentary is on each word to understand it’s meaning not only the translation.
• Mekor Habiur – The Source from where the Mechaber is taking the meaning as he explains it.
• Tosfos Biur – Other ways to learn the Shir, and what should a person learn from each Animal
  

Also the Biur Kitzur Simcha VeHodah
Which is a Translation in a easier Hebrew just for the word meaning only, Which is very useful to use when saying the Perek Shirah to make sure that you understand the words, therefore it’s placed on the side of the separate part of the Sefer which has the Perek Shirah all together in a few pages (see picture below).