Sockeye salmon are red, which is the usual color of females. Even small changes in wavelength, saturation, and brightness can affect preference. Both sexually naïve males and experienced males showed the same preferences, which illustrates that preference for a red hue may be innate. Some traits that lead to reproductive success, such as body size and sexual dimorphism can affect one’s survival. This leads to opposing pressures of natural selection and sexual selection. Larger males are favored, unless the risk of predation is very high. Sockeye salmon that die prematurely from predation are typically the larger ones in a population. This shows
What Makes a Battle What Makes a Battle What Makes a Battle was a propaganda short produced by the US Army Pictoral Service in 1944. It documents the taking of the Marshall Islands while also encouraging increased war production. The film opens with the narrator asking "What makes a battle?" while the camera is focusing on shipments of industrial transports, "This is what it takes to make a battle." This statement sets up the dual nature of the entire film. War supplies are pouring in from every part of the country, from every type of American "Republican and Democrat, white and colored." Industrial production