During its annual migration, the red knot, a medium-size shorebird, flies the entire length of north and south america. during o
ne critical stop to feed on the eggs of horseshoe crabs, the birds nearly double their body mass. the relationship between the red knot and the horseshoe crab is that of
<span>The relationship between the red knot and the horseshoe crab is that of parasitism. The red knot benefits at the expense of the horseshoe crabs while the horseshoe crab only loses.</span>
