Astrology itself is just one big system of omen reading. It is the greatest system of omen reading in that we can calculate the past and future with it, and it has a more objective quality than just cards and watching animals in nature. It can get more detailed than other systems like card reading. But sometimes we do not need to get so detailed, and so all jyotishis must be at least somewhat familiar with nimmita, the art of reading omens.
I have composed a short series of videos with examples of how I have read animal omens in life and during readings in order to answer questions. This is useful and fun and an enriching thing to know. We do not always have to stare at the chart, sometimes just looking up and observing nature will help do the trick.
Check out my youtube channel for more videos on astrology