What is necessary to conduct regular studies on migratory birds?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. The birds under study should be ringed..
Explanation: The passage states, "The ringing of flamingoes is mandatory to conduct accurate and long-term studies on the birds." Ringing helps track migratory patterns and collect consistent data.
Staying with birds or watching them continuously is impractical due to the inhospitable terrain.
Knowing their place of origin is a result of proper study, not a prerequisite.
Final Statement: Ringing is essential for regular and accurate tracking of migratory birds.
Conclusion: The correct answer is The birds under study should be ringed.