# Even the stork in heaven knows the right times; and the doves, swifts, and cranes

These birds know the right times to migrate, flying from one place to another for feeding or breeding.

# stork ... doves, swifts, and cranes

All of these are different types of birds that migrate.

# They go on their migrations at the right time, but my people do not know Yahweh's decrees

The implied information is that the people should have naturally known Yahweh's decrees.

# They go on their migrations

"They migrate" or "They fly from one region to another"