Gavin Van Horn

Chicago is not defined solely by its human residents. It’s a city with a living, evolving "ecological web of interactions" between man and animal, according to Gavin Van Horn. He joins "Chicago Tonight" to talk about "City Creatures," a book which details urban wildlife history through essays, poetry, photography and paintings.

To mark the 157th anniversary of Chicago's first science museum, we take a look at some surprising specimens - including a Chicago rattlesnake.

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