Which risk increases when migratory birds rapidly increase flight wing loading immediately before long-distance journeys?

💡 Explanation

When migratory birds increase wing loading by rapidly gaining mass, increased surface friction degrades feather structure because the overlapping barbs and barbules experience higher stress during flight, leading to failure. Therefore premature wear results, rather than boosted skills, reduced parasites, or enhanced abilities which don't result directly from structural stresses.

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