Animal Tracks: Oct. 27 - Nov. 3

Sheep are mustered through the city center to promote the conservation of the ancient paths of migration dating back some 8,000 years in Madrid, on Nov. 2. Two thousand sheep passed through the city centre joined by shepherds, marking the annual livestock migration festival which has taken place in the Spanish capital since 1994.

A hippopotamus catches a pumpkin during Halloween celebrations in the Tiergarten Schoenbrunn zoo in Vienna, Austria, on Oct. 31.

A lion is seen at the Uganda Wildlife Education Centre in Entebbe, Uganda, on Oct. 31.

Tortoises eat their food from inside a pumpkin during Halloween celebrations at Madrid Zoo, on Oct. 31.

A Western Lowland Gorilla sits in its enclosure at Taronga Zoo in Sydney, on Oct. 31.

A giraffe eats in front of the Sydney Opera House during feeding time at Taronga Zoo, on Oct. 31.

White whale or beluga Zhuoya gives birth to her first offspring at an aquarium in Changsha, Hunan province, China, on Oct. 29.

A duck paddles on Loch Faskally, as autumn leaves are reflected in the water, in Pitlochry, Scotland, on Oct. 29.

An orangutan eats a pumpkin during Halloween celebration in Tiergarten Schoenbrunn zoo in Vienna, Austria, on Oct. 31.

Eintracht Frankfurt's eagle mascot Attila is seen before their match against Borussia Moenchengladbach during their German soccer cup in Frankfurt Oct. 29.

A dragonfly rests on the boundary line of a cricket ground in Kathmandu, Nepal, on Oct. 27.

A deer bellows in a field near a forest near Duelmen, western Germany, on Oct. 28.

An snow leopard is pictured at the Chapultepec Zoo, in Mexico City, on Oct. 27.

A purple-rumped sunbird pecks at its own image reflected off a window at an office in Colombo, Sri Lanka, on Oct. 27.