The sanderling is a shorebird that feeds on insects and small crustaceans such as crabs. Sanderlings that are beyond breeding age often stay in the southern feeding grounds and do not migrate north during spring and summer. What is the most likely reason that nonbreeding sanderlings remain in the southern feeding grounds?
They are more vulnerable to predators in the tundra region than breeding sanderlings.
They have enough food in the tropical region and are no longer searching for mates.
They have adapted to the warmer weather.
They rear their young on the southern coast.
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