I would be glad to see amphibians who, before the advent of intelligence, were engaged in digging holes, and their life was similar to that of meerkats. Despite the fact that these are in fact amphibians with gill breathing (combined with pulmonary breathing), males have feathers on the tail that interfere with swimming (thus, the male winning the race (marriage games) shows that, despite the fact that feathers interfere with him, he is still good). Over time, they increase in size, also developing external gills, and from simple holes in the silt they move on to digging huge colonies, inside of which mosses and lichens grow, saturating the colonies with oxygen. Years, millennia go by… Creatures grow to about the size of a man, able to move for some time only on their hind limbs in order to free their burrowing front ones. They eat everything they can, from vegetation to fish. Some species pass to life in flooded caves near the swamp, the colonies begin to live in a new way, the forelimbs become dexterous, but, however, they mostly move anyway, crawling on all fours. The feathers of the males remain, and they develop beautiful tails, albeit useless. When the first colony settles in the cave system, after millions of years, some colonies lose their eyes, many die out, and those that live in caves with water reservoirs, despite the fact that they do not have long to go to the surface, agriculture begins to develop. First of all, I grow fungi, but, in water tanks into which light enters (they gouge tunnels above the tanks through which it penetrates there), algae are grown, which, firstly, saturate the system with oxygen, and secondly, are used in food quality. Several different races are formed in one cave, as their ancestors were engaged in different things - the descendants of farmers have dark skin, bright tail feathers, brown eyes, powerful muscles, they have no women at all. The second race are aquatic farmers, they have more graceful bodies, rather light gray skin with green patches, and long tails devoid of feathers. Males of this race are very rare. We can say that both of them are one race with gender differences. The last race was almost always in the depths of the caves, and therefore, has huge blue eyes, excellent hearing, white skin through which blood vessels are visible, as well as a fairly slender physique and long tails with a fin fold. Women of this race are considered the most beautiful. Despite the development of intelligence, they are in no hurry to switch to upright posture, although they acquire much more dexterous hands. Basically, they are engaged in crop production and hunting, but after a couple of hundred years, a brave hero gets a large herbivorous amphibian, and also brings her living children. Now, co-development with pets begins. Over time, they realize that releasing some of the blood of animals is much more efficient, and therefore, they began to add animal blood to food, but they don’t completely refuse meat, they often make meat with mushroom sauce (consists of several types of mushrooms and blood, plus salt, which one is not known). They live a long time and can regenerate many injuries, like the same axolotls as domestic animals, so their meat can be obtained without killing them. So time passes, they open fire, cooking flourishes, entire caves are allocated for kitchens, and they themselves live in fairly good conditions, without wars, since their long life expectancy does not force them to multiply much. But, there is one nuance, at a certain moment their rapid settlement began in the cave, many had to wander for a long time on the surface (for them it is like a desert) to find a new place to live, and all this is due to a sharp jump in the birth rate, which is now grows and grows. Over time, there are almost no caves left on the continent that are not yet occupied by them … I’m too lazy to write further