I use my chickens as a garbage disposal for any food that is not moldy or otherwise spoiled, and they LOVE beans of any kind-- great protein source. I would not be worried about the salt content of a couple cans personally, but my chicken feeding attitude is a bit laissez-faire.
Garbanzo beans are awesome for HUMANS processed into hummus, a middle eastern bean dip served with pita bread or corn chips:
HUMMUS
1 15 oz can chickpeas drained, reserve 1/4 cup juice
1 cloves garlic minced
1-2 tsp lemon
½ teaspoon salt
1/2-1 tsp ground cumin
2 tablespoons tahini
1-2 Tablespoons virgin olive oil
Place all ingredients in your food processor with the S blade and puree to a smooth creamy consistency. Garnish with paprika, olives, or parsley and drizzle with olive oil.