A detailed oil painting by Rosa Bonheur depicting a lion standing in a rugged, mountainous setting, completed in 1880.

Rosa Bonheur, a French painter known for her meticulous observation of animals, produced this study of a lion in 1880. The work demonstrates her ability to capture the physical presence and anatomy of large mammals. The lion stands in profile, its gaze directed towards the left, positioned against a backdrop of rugged, mountainous terrain. Bonheur utilised a palette of earthy tones, ranging from the golden ochre of the lion's coat to the muted blues and greys of the distant peaks.

Bonheur maintained a private menagerie at her estate in By, near the Forest of Fontainebleau, which allowed her to study exotic animals from life. This direct observation informs the rendering of the lion's musculature and the texture of its mane. The composition is balanced, with the animal occupying the foreground, creating a clear separation between the subject and the atmospheric distance of the mountains. The brushwork is controlled, focusing on the tactile quality of the fur and the rocky ground beneath the lion's paws.

Unlike many of her contemporaries who placed animals within narrative or allegorical scenes, Bonheur often treated her subjects with a scientific detachment. This painting reflects her interest in the natural world and her technical proficiency in oil painting. The lighting is consistent with an open, outdoor setting, casting soft shadows that define the form of the lion without resorting to excessive drama. The work remains a representative example of her later career, during which she continued to refine her approach to animal portraiture through careful study and disciplined execution.