why does an archerfish need to be still
Archerfish Archerfish are remarkably accurate in their shooting; an adult fish almost always hits the target on the first shot. They can bring down insects and other prey[5] up to 3 m (10 ft) above the water's surface.[6] This is partially due to their good eyesight, but also to their ability to compensate for the refraction of light as it passes through the air-water interface when aiming at their prey.[7] They typically spit at prey at a mean angle of about 74° from the horizontal but can still aim accurately when spitting at angles between 45° and 110°.[8]
Remora Remora front dorsal fins have evolved to enable them to adhere by suction to smooth surfaces and they spend their lives clinging to a host animal such as a whale, turtle, shark or ray. It is probably a mutualistic arrangement as the remora can move around on the host, removing ectoparasites and loose flakes of skin, while benefiting from the protection provided by the host, and the constant flow of water across its gills.[5] Although it was initially believed that remoras fed off particulate matter from the host's meals, this has been shown a falsehood; in reality their diets are primarily composed of host feces instead.[6]