Arizona recently raised an arsenic limit at one monitoring well at Pinyon Plain Mine, where scientists are still trying to understand how water moves underground.

As with most birds, food sources are always a draw, but ravens might also decide your home is the perfect place to rest or even nest.

As temperatures drop and natural food sources become harder for wildlife to find, your yard can become an important refreshment stop for winter birds. But simply getting whatever bird feeder you can find and filling it with seed isn’t always helpful. The type of feeder, where you place it and how often you clean it can all affect which birds show up and whether you accidentally invite squirrels, mice and other pests into your yard as well.