What are some challenges animals might face when migrating?

Some challenges animals might face when migrating are disease, global climate change, overexploitation, and habitat destruction.

Explanation:

In virtually every corner of the globe, migratory animals face a growing array of threats, including habitat destruction, overexploitation, disease, and global climate change. Saving the great migrations will be one of the most difficult conservation challenges of the 21st century.

Lack of food