Tracking and foraging are survival skills, and requires a Wisdom (Survival) check with a degree of difficulty based on the circumstance, show in the DC tables below.

Foraging - Food & Water

Food & Water Availability	Survival DC
Abundant food and water	Survival DC:  10
Limited food and water sources	Survival DC:  15
Very little, if any, food and water sources	Survival DC:  20

Foraging - Ingredients

Method of Search	Survival DC
Dedicated search without traveling	Survival DC:  10
Traveling at a slow or stealthy pace	Survival DC:  15
Traveling at a normal pace	Survival DC:  18
Travel at a fast pace	Survival DC:  21

Tracking

Ground Surface	Survival DC
Soft surface such as snow or sand	Survival DC:  10
Dirt or grass	Survival DC:  15
Bare stone	Survival DC:  20
Each day since the creature passed	Survival DC:  +5
Creature left a trail such as blood	Survival DC:  -5