Birds Stop During Migration to Avoid Disease or Infection
[html]During their long migration journeys, birds do more than just refuel and gain energy at their stopover locations. Learn how birds need to build their immunity during migration.[/html]
Source: Birds Stop During Migration to Avoid Disease or Infection (http://ht**://www.discovermagazine.c**/planet-earth/birds-stop-during-migration-to-avoid-disease-or-infection)