The ancient Pingyao city wall first built about 2700 years ago and expanded in the Ming Dynasty, Pingyao, UNESCO World Heritage Site, Shanxi, China, Asia

The Metro system being expanded in Calcutta, India,

The Metro system being expanded in Calcutta, India,

Late phase of an oblique lunge. The Minke whale (Balaenoptera acutorostrata) falls back into the water while its throat is still expanded and water is pushed out under high pressure. St. Lawrence estuary, Canada

Amazing closeup of a lunging Minke whale (Balaenoptera acutorostrata) feeding on krill. Some of these small euphausiids are still hanging on to the expanded grooves. St. Lawrence estuary, Canada

A perfect oblique lunge of a Minke whale (Balaenoptera acutorostrata) surface feeding in the early evening. Its Grooves are expanded and water is purged out, two main characteristics of a feeding strike. St. Lawrence estuary, Canada

A dense net of blood vessels colour the belly of Minke whales (Balaenoptera acutorostrata) named Picasso pink during high feeding activity. St. Lawrence estuary, Canada

Like a piece of art thousands of waterdrops cover the expanded belly of a Minke whale (Balaenoptera acutorostrata) performing a ventral arc. St. Lawrence estuary, Canada

Male great frigate bird (Fregata minor) showing expanded gular pouch near nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador, Pacific Ocean.

Male great frigate bird (Fregata minor) in flight showing expanded gular pouch near nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp (Artemia salina) in saltwater lagoons in the Galapagos Island Group, Ecuador. Pacific Ocean.

Closeup of the expanded grooves of a giant Blue whale (Balaenoptera musculus) during a lateral lunge, a feeding strike occasionally seen in the St. Lawrence estuary, Canada.

Black-blotched porcupinefish inflated at night, Diodon liturosus, Similan Islands, Thailand, Andaman Sea, Southeast Asia, Asia

Humpback whale (Megaptera novaeangliae) surfacing while feeding with throat groves expanded to engulf water containing itsr prey. Olafsvik, Iceland.

Humpback whales (Megaptera novaeangliae) surfacing during feeding with throat groves expanded to engulf water containing their prey. Olafsvik, Iceland.

Hawaii, Spotted Pufferfish expanded floating in blue ocean (Arothron meleagris).

Step-by-step preparation of a forced narcissus planter. filling of a watertight planter with expanded clay balls.

Step-by-step preparation of a forced narcissus planter. Filling the space between the bulbs with expanded clay.

Step-by-step preparation of a forced narcissus planter. Installation of narcissus bulbs on a bed of expanded clay.