I read a fantasy book many years ago. It was part of a series and involved the main character transferring his mind (or having it transferred) into the body of an animal, and a different one in each volume of the series. Would have been mid-eighties or earlier.
Sorry, but the information is very vague. It was definitely in a series as I read only the second or third in the set. I borrowed it from the local library and they were unable to procure any more in the series and I forgot about it until recently. I don't know what brought it to mind.
It was told from the main character's perspective, if memory serves me correctly, and did not take place on Earth. Spell singer came to mind when I tried looking for it again, but I know it's not that.