Shepherd Nuno Miguel, 34, holds a lamb as he herds his flock to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. In late June, shepherds young and old in the Seia region of central Portugal start guiding sheep, goats and cattle to the Serra da Estrela, the country’s highest mountains, in search of better pastures. There they stay until the end of September. Modern-day shepherds may have mobile phones to keep in touch with family and friends, but their lifestyle has changed little for centuries. The sound of cowbells and the bark of longhaired mastiffs starts early in the morning as the animals – often decorated with traditional woollen balls on their horns – are herded up steep, narrow paths. (Photo by Rafael Marchante/Reuters)

Shepherds direct their herd as they migrate to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds herd their flock as they migrate to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd searches for the best path as he herds his flock to summer pastures in the Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Sheep walk as they are herded to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd herds his flock as they migrate to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd greets others as they herd their flock to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherd Miguel Pula (R), 38, jokes with Denis as they herd their flock to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds Miguel Pula (R) and Nuno Miguel, prepare lunch as they herd their flock to summer pastures in Serra da Estrela, near Seia, Portugal June 29, 2015. (Photo by Rafael Marchante/Reuters)

Shepherd Miguel Pula, 38, rests near his flock as he herds them to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd searches for the best path for his flock as he herds them to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds Miguel Pula (L) and Nuno Miguel, guard the flock as they migrate to summer pastures in Serra da Estrela, near Seia, Portugal June 29, 2015. (Photo by Rafael Marchante/Reuters)

Shepherd Nuno Miguel prepares lunch as he herds his flock to summer pastures in Serra da Estrela, near Seia, Portugal June 29, 2015. (Photo by Rafael Marchante/Reuters)

Shepherd Andres, 21, rests near his flock as they are herded to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd checks his mobile phone before going to sleep, as he herds the flock to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherd Pedro Gomes removes traditional ornaments from a goat as the flock is herded to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd places traditional bells on the grass as they herd their flock to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds sleep outside as they herd their flock to summer pastures in Serra da Estrela, near Seia, Portugal June 28, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd takes a picture of the flock as they are herded to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

A group of shepherds arrive in the village of Sabugueiro at the end of the day, as they herd a flock to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds are given a lift by a car as they herd a flock to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

A shepherd directs a flock in the small village of Sabugueiro, as they migrate to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)

Shepherds direct a flock as they herd them to summer pastures in Serra da Estrela, near Seia, Portugal June 27, 2015. (Photo by Rafael Marchante/Reuters)