Are there meforshim on perek shira? I'm looking for anything besides artscroll. If there are many, which would you recommend to start?
here is an archive of lots of shiurim on perek shira http://revach.net/avodah/perek-shira/19
I recommend Perek Shirah: Nature's Song, by R' Natan Slifkin. He does a great job of explaining both what Perek Shirah is all about and what each element can teach us. He combines traditional commentaries on both Perek Shirah and its source verses with his knowledge of zoology and other natural sciences, and provides precise citations of all his sources to facilitate further study.