Dr. Bubó is a short-eared owl who, after obtaining his medical degree with excellent qualifications , sets up his clinic inside an oak tree, where he heals the sick inhabitants of the forest with the help of his assistant - the nurse of the clinic - Nurse Ursula.
The river water is so polluted that it poisons the carp. The Sergeant tries to catch the polluters one by one, with little success. The Doc then decides to organize a song evening for public education purposes.
The animals are becoming increasingly superstitious. Sergeant works to expose fraudsters who exploit good faith, while Doctor Bubo nurses the souls of those afflicted by prejudice.
Doctor Bubo presents his motion for animal rights to the parliament. After the motion is accepted, the expansion of rights – often self-serving and disregarding others – begins, and the rights of the weaker ones are completely undermined...
As winter approaches, tourism to "otherworldly" landscapes booms - organized by the crocodile, the eagle and the hyena. The Doctor initially supports the projects because of the positive effects of travel, but when he also sends Ursula into the desert to fight winter sleep, events take a chilling turn.
Sergeant is determined to fight against the increasing number of divorces, but the desire to divorce is not decreasing, but increasing. In response to the husbands' dissatisfaction, the doctor performs plastic surgery on the wives, and the forest ranger does his job with moral compasses.
The discovery of a drugged patient and a drugged cigar draws the attention of Sergeant and the doctor to organized crime. A raid at the port yields no results, so the doctor resorts to a more drastic solution and enters the market as a competitor.
Since Prohibition, the liquor dealers have been passing on the illegal liquor with selective ingenuity. The Sergeant and the doctor can only treat the situation symptomatically, so Doctor Bubo decides that, no matter what it takes, the withdrawal department must be built.
The ox enters a quiz to find out how big a cow he is. Doctor Bubo wants to help him, so he teaches him the answers to the next quiz in his sleep.
The fashion dictator Blue Fox drives husbands crazy, unable to satisfy their wives' latest whims. The situation reaches its peak when the doctor's office is robbed.
As gambling addiction spreads, more and more people are gambling their pants off. The sergeant, along with his friend the doctor, are on the trail, but they are stuck due to a lack of evidence. The suspect is released so they can follow him.
They try to bribe the doctor, and Sergeant investigates doping at the horse race. He also involves Bubo in the work, but the doctor's peculiar medical methods only make Ursula happy.
Reading Vizsla's crime novels, everyone thinks they are a crime expert, even Doctor Bubo; and since Sergeant is still unable to unravel the series of murders committed in the poultry yard, he takes action himself with some help.
Sergeant trains gorilla bodyguards to defend against the terrorists' increasing attacks. Dr. Bubo and Ursula, who know nothing about it, are fed up with Sergeant's helplessness against the animal-stealing terrorists and take action. But a slip of the tongue misleads them.