List of foods that crickets will eat as an omnivore:
Apples
Oranges
Bananas
Grapes
Meat
Pet food
Nuts
lettuce
Carrots
Potatoes
Pumpkin
Grass
Ladybugs
Mulch
Tropical fish flakes
Alfalfa
Wheat germ
Other crickets
Aphids
Cornflakes
Tomatoes
Mites
Leaves
Bread
Squash
Basically they will eat about anything. More info.
Crickets eat food and avoid predators. Some have stripes, long legs, and wings.