Which statement is best supported by the image? The birds are close together so they have a better chance of finding mates and increasing their reproductive success.
The birds are part of a eusocial society so they have a better chance of finding mates and increasing their reproductive success.
The birds are aerodynamically efficient so they can use the air around them to reduce the energy used to fly.
The birds are part of a eusocial society so they can use the air around them to reduce the energy used to fly.