Thanks for giving me an excuse to recommend "A Deepness in the Sky", by far my favorite science fiction book with a planet of sentient spiders. It's the second in a series, but the first two book can be read out of order. https://www.amazon.com/Deepness-Sky-Zones-Thought/dp/0812536... (The first book is good too; The third one was OK, but not as great as the first two.)