This hypothesis assumes: These factors decrease relative food competition since control over a food source by an individual is not correlated to the duration or richness of said source. The passing of information acts to create a foraging group. Group foraging decreases predation and increases relative feeding time at the cost of sharing a food source. The decrease in predation is due to the dilution factor and an early warning system created by having multiple animals alert. Increases in relative feeding are explained by decreasing time spent watching for predators and social learning. Recruiting new members to food patches benefits successful foragers by increasing relative numbers. With the addition of new members to a group the benefits of group foraging increase until the group size is larger than the food source is able to support. Less successful foragers benefit by gaining knowledge of where food sources are located. Aerial displays are used to recruit individuals to participate in group foraging. However, not all birds display since not all birds are members in a group or are part of a group that is seeking participants. In the presence of patchy resources, Richner and Heeb propose the simplest manner would be to form a communal roost and recruit participants there. In other words, recruitment to foraging groups explains the presence of these communal roosts. Support for the RCH has been shown in ravens ("Covus corax"). Reviewing a previous study by John Marzluff, Bernd Heinrich, and Colleen Marzluff, Etienne Danchin and Heinz Richner demonstrate that the collected data proves the RCH instead of the Information Center Hypothesis supported by Marzluff, et al. Both knowledgeable and naïve ("clueless") birds are shown to make up the roosts and leave them at the same time, with the naïve birds being led to the food sources. Aerial demonstrations were shown to peak around the same time as the discovery of a new food source. These communities were made up of non-breeders which forage in patchily distributed food environments, following the assumptions made by Richner and Heeb. In 2014, Sarangi et. al. shown that the recruitment centre hypothesis did not hold in the study population of Common Mynas ("Acridotheres tristis") and hence Common Myna roosts are not recruitment centres. At this point in time there has been no additional scientific evidence excluding RCH or any evidence of overwhelming support. What is overlooked by RCH is that information may also be passed within the communal roost which increases and solidifies the community.