Helping out with nature?

I really love nature, and being surrounded by it, helping out with the birds to the ants. Now its winter though, and I feel so like restless. Is there anything I could do to help out animals? I started reading nature books, and everything is for spring and summer! I live in zone 6-7 in Long Island. Some info on my yard: I have a small pond, 100-250 gallons, Most of my yard is brick, I have a vegatable garden, my backyard is like this: Pond with rocks around it, pebbles, brick patio, and a little garden, about 10'x 30'. Any suggestions on helping the birdies, or frogs, or bugs, or hedge hogs, or any other wildlife near me at this time of year?