That's probably because both eyes of the nonlateralized fish were forced to share prey-catching and predator-monitoring duties.
Competitors are taking market share, preying on Zale's tenuous credit position, yet investors aren't flocking to the would-be winners in the jewelry space like they are gold.
Despite these two big cats' overlapping ranges, their similar habits and shared prey preferences are some of the reasons they carefully avoid each other -- effectively making each species even more scarce.
For example, group members may benefit by sharing prey or evade other predators more effectively in the group, but remaining in the group may also reduce their own reproduction.
In contrast to Degerman et al., they found a decrease in fish species that shared prey with the crayfish, while piscivorous fish showed no such reactions.
Movements by crayfish can also distract predatory bass, allowing their shared prey, sculpin, to escape [65].
All family members assist young through various tasks such as defense, grooming, and sharing prey, although the relative contribution of helpers varies by individual and by age [19].
That Cacao's family members regularly assisted her, including sharing prey is, to my knowledge, a new observation for the species.
Figure 1 demonstrates the 2007 declines in Cacao's rates of catching large (≥30cm) fish and sharing prey, but it also shows that generally, sharing rates for other family members decreased in 2007 relative to 2004 2006, while catch rates of large fish increased (but rarely with statistical significance).
