More mountain ranges have been drawn, in a bid to better understand the diversity of habitats and wildlife found on them.
More than 4,000 drawings have been published on the US Geological Survey website, including one that looks at a rock in a region known as the Grand Canyon National Park.
The drawings show an animal called a montane salamander, which are native to Arizona, New Mexico and Utah.
They are a large salamanders, with a body measuring up to 5.6 metres long.
The animal is depicted sitting on a rock, and its feet are covered in scales.
It is also shown to be covered in a long, black tuft of fur.
The drawing was first posted on the website on February 14.
The caption reads: ‘Grand Canyon Salamander’ by Joe L. McBride.
It has been viewed more than 6.5 million times and garnered over 3.6 million views.
It is the latest of several drawings to be published on USGS, and comes amid increasing interest in the species.
It’s thought the creatures are an endangered species and that it is time to draw a new line.
Last month, an Arizona resident drew a drawing of an animal that looked like a rattlesnake on a canyon wall.