Sure. 'Starship Troopers' by Robert A. Heinlein is a classic. It has the Bugs, a very formidable alien species that the humans fight against. Another is 'The Left Hand of Darkness' by Ursula K. Le Guin. It features the Gethenians, an alien race with a unique gender - related concept. And 'Ringworld' by Larry Niven, which has some strange and interesting alien - like elements in the story.
I would say 'Old Man's War' by John Scalzi is really good. It has various alien species that the humans interact with in a military context. 'Blindsight' by Peter Watts is also a great one. The vampires in this book can be seen as a sort of alien life form in a very unique way. Also, 'Anathem' by Neal Stephenson has some interesting alien - adjacent concepts.
Chapter 345, "Mirror Valley Defense Commander Luo Ming, Beast Tide, Great Xia's 6 Armies (Part 3)", is the clearest early answer because it turns Beast Tide's situation into a concrete plot event. The chapter gives readers a real answer by opening on Not counting Long Mountain, East Ridge, and Wuyuan, the three major... and ending on It's heard that the number of Cold Resistance Levels in the Dragon....
Chapter 316, "Blood Jade Fox and Teasing, Boiling Xia City, Migration Begins (Part 3)", is the clearest early answer because it pushes Great Xia into a new phase or setting. The setup is Li Xuanling and Li Tiancheng both walked over from behind at this..., but the pressure keeps building through The two of them looked at Xia Hong, the shock on their faces still....
Chapter 316, "Blood Jade Fox and Teasing, Boiling Xia City, Migration Begins (Part 6)", is the clearest early answer because it pushes Qiu Peng into a new phase or setting. Early on, Xu Ning clearly didn't want to say more on this topic and suddenly.... By the end, It was said to be woven one strand at a time using Bamboo Silk and....
Chapter 321, "Purging the Yanglu Realm, Long Wu's Army Assembles (Part 2)", is the clearest early answer because Wang Yuan finally turns buildup into a real advancement. The chapter gives readers a real answer by opening on A group of vile beasts, daring to act ferociously, kill!" The three... and ending on By this time, more than fifty intermediate Cold Beasts below the....
Chapter 86, "If you don't welcome me, why should I stay?", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. It opens with After over an hour of fuss, it was finally time to eat. and closes on But then her expression became resolute and arrogant..
Chapter 327, "The Beast Tide Battle, the Wolf King and the Trump Card, White Dew Gu's Desperate Situation (4)", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from Unveil the tarp, prepare the Divine Machine Crossbow!" Xia Hong's... to Fwoom… Fwoom… Ultimately, the bowstring couldn't withstand the force....
Chapter 153, "Word Spreads, Director Sun Takes the Lead in Shipping the CP!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Wisps of smoke gradually rose from the small kitchen.
Chapter 29, "The 36 Strategies - Sneak through Chen Cang", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Big brother, it's me..." The shadow suddenly spoke and it was Jiang...
Chapter 310, "The Leader Is Still the Best, The Consequences of Losing the Bet", is the clearest early answer because it turns Li Xuanling's situation into a concrete plot event. The chapter gives readers a real answer by opening on You should be very clear about the consequence of losing a gamble,... and ending on Do you really think that last night I was able to lead an army to....