Is a form of taxis seen in many aquatic organisms, e.g., fish, whereby they will (generally) turn to face into an oncoming current. In a flowing stream, this behavior leads them to hold position in a stream rather than being swept downstream by the current. In fish that exhibit rheotaxis, it can easily be demonstrated by creating an artificial current within a tank using pumps. No matter which way…

In behavior, normal refers to a lack of significant deviation from the average. The phrase "not normal" is often applied in a negative sense (asserting that someone or some situation is improper, sick, etc.). Abnormality varies greatly in how pleasant or unpleasant this is for other people; somebody may half-jokingly be called "pleasantly disturbed"