Two brown birds adjacent on a wire

Eight birds, two brown and six red, settle on a power line in a uniformly random order. How likely is it that the brown pair end up perched right next to each other?

$1/4$. There are $\binom82=28$ equally likely pairs of positions for the brown birds, and 7 of those pairs are adjacent, giving $\tfrac{7}{28}=\tfrac14$.