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Railroad bridges
15
Snakes
15
Visitors' centers
15
Tree trunks
14
Butterflies
13
Lizards
13
Birds
12
Canoes and canoeing
12
Roads
11
Abandoned houses
10
Leaves
9
Boats
8
Bridges
8
Children
8
Plants
8
Spiders
8
Biosphere reserves
7
Fire fighters
7
Lakes
7
Parking lots
7