Nature Calls font here refers to the font used in the poster of Nature Calls, which is an American comedy movie released in 2012.
The font used for the movie title in the poster is probably Aachen Bold. The font is a commercial one and you can view more details about it here.
Download Aachen Font
The Aachen font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.