bird 34,477, avian 28,612, forest 13,388, outdoors 12,414, background 11,168, outside 10,272, tree 8,199, sky 8,002, grass 6,766, plant 5,916, clouds 4,379, trees 4,031, window 3,377, woods 2,662, cloud 2,563, scenery 1,937, plants 1,795, birds 1,627, electric 1,424, windows 1,095, door 1,074, travel 485, windshield 423, track 318, step 310, traveling 230, railroad 188, tracks 127, doors 108, transportation 97, rail 95, steps 75, windshield wipers 47, electric train 46, headlight 40, trolley car 18, street car 17, power line 7

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