Question

individuals of bird species fly together in flocks. when two or more species of birds fly together, the flock is called a mixed flock. the main species in a mixed flock is considered the core, and the joining species is considered the satellite group. which sentence describes a likely reason that birds of one species might join another species flock? a birds that form the satellite group have less competition for resources when they fly alone. b birds that form the satellite group use more energy to maintain the same flying speed as birds in the core. c birds that form the satellite group gain a protective advantage against predators by flying with a larger group. d birds that form the satellite group blend into their surroundings better when they fly with different bird species.

Explanation:

The question asks for a reason why birds of one species might join another species' flock. Option a states that birds in the satellite group have less competition for resources when flying alone, which is not a reason for joining. Option b about energy - use for flying speed is not related to the reason for joining. Option d about blending in is not the main reason for joining. Option c mentions gaining a protective advantage against predators by flying with a larger group, which is a likely reason for one - species birds to join another species' flock.

Answer:

C. Birds that form the satellite group gain a protective advantage against predators by flying with a larger group.