Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Red-footed Booby (Sula sula) brown morph nesting in Mangrove (Avicennia sp), Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) female laying egg with male waiting to take over first incubation stint, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) males in courtship display clustering together to attract females, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, world's only nocturnal and pelagic gull departs at dusk to feed far offshore, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) female carrying nesting material, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) large fledgling being fed by parent near nest site, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) pair engaged in mutual preening, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male flying, showing courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Large Ground Finch (Geospiza magnirostris) endemic, extra large bill for cracking large seeds, largest of the 13 species of Darwin's Finches, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with fully inflated throat pouch, Darwin Bay, Genovesa

Tui De Roy / Red-footed Booby (Sula sula) brown morph in Palo Santo tree, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) subadult bulls sparring, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) females passing displaying male under close inspection, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Brown Pelican (Pelecanus occidentalis) adult in resplendent breeding colors, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Large Ground Finch (Geospiza magnirostris) endemic, extra large bill for cracking large seeds, largest of the 13 species of Darwin's Finches, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Large Ground Finch (Geospiza magnirostris) endemic, extra large bill for cracking large seeds, largest of the 13 species of Darwin's Finches, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) pair guarding large chick, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Ruddy Turnstone (Arenaria interpres) migrant in winter plumage, feeding in tidal zone on overwintering grounds, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch, Darwin Bay, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) males in aerial dogfight to steal each other's nesting material, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, world's only nocturnal and pelagic gull departs at dusk to feed far offshore, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, world's only nocturnal and pelagic gull departs at dusk to feed far offshore, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, guarding chick in pebble nest, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, pair mating at dusk, world's only nocturnal gull, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, pair mating at dusk, world's only nocturnal gull, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) couple allopreening during courtship, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) couple allopreening during courtship, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) world's only nocturnal Gull, mating couple Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) world's only nocturnal Gull, at pebble nest with chick, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) incubating eggs in pebble nest, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Red-footed Booby (Sula sula) brown morph incubating, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) fledgling stretching wings, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) couple courting at sunset, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) calling at nest site, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) showing binocular vision, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) calling, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) portrait, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) female on nest incubating, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with extended gular pouch with female, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) flying, approaching nesting cliff, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Red-billed Tropicbird (Phaethon aethereus) flying, approaching nesting cliff, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male in courtship display with fully inflated gular air pouch, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Common Cactus-Finch (Geospiza scandens) feeding on (Opuntia sp) cactus bud, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Large Ground Finch (Geospiza magnirostris) portrait, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male with pouch inflated in full courtship display, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) male with pouch inflated in full courtship display, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) aggressive pair driving incubating Frigatebird off her ground level nest, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Dove (Zenaida galapagoensis) portrait, side view, endemic, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Red-footed Booby (Sula sula) white morph flying, Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, world's only nocturnal and pelagic gull departs at dusk to feed far offshore, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Swallow-tailed Gull (Creagrus furcatus) endemic, world's only nocturnal and pelagic gull departs at dusk to feed far offshore, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) juvenile flying over the ocean, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Red-footed Booby (Sula sula) white morph represents only five percent of the Galapagos population but is reverse elsewhere, Genovesa Tower Island, Galapagos Islands, Ecuador

Fred Bavendam / Guineafowl Pufferfish (Arothron meleagris) in its golden color phase puffed up, side view, Tower Island, Galapagos Islands, Ecuador

Pete Oxford / Red footed booby {Sula sula}, Tower (Genovesa) Island Galapagos

Pete Oxford / Red footed booby {Sula sula} on nest, Tower/Genovesa Island Galapagos Islands, Ecuador Book page 72

Pete Oxford / Large cactus ground finch {Geospiza conirostris} on cactus, Tower Island, Galapagos

Pete Oxford / Large cactus ground finch {Geospiza conirostris} on cactus, Tower Island, Galapagos

Pete Oxford / Great frigate bird {Fregata minor} male displaying to female Tower Island, Galapagos, Ecuador.

Pete Oxford / Great Frigate bird (Fregeta minor) male courtship display with pouch fully inflated. Galapagos, Tower Orgenoves Island

Pete Oxford / Great frigate birds (Fregata minor) in courtship. Tower Island, Galapagos

Pete Oxford / Great frigate bird {Fregata minor}, Tower Island, Galapagos

Pete Oxford / Great frigate bird {Fregeta minor} male display Tower (Genovesa) Island, Galapagos

Pete Oxford / Swallow tailed gull {Creagrus furcatus} portrait, Tower (Genovesa) Island, Galapagos Islands

Kevin Schafer / Swallow-tailed Gull (Creagrus furcatus) on nest, Genovesa Island, Galapagos Islands, Ecuador

Onne van der Wal / Little Harbor whisper jet powerboat with tuna fishing tower. Rhode Island, USA

Onne van der Wal / Little Harbor whisper jet powerboat with tuna fishing tower. Rhode Island, USA

Onne van der Wal / Little Harbor whisper jet powerboat with tuna fishing tower, Rhode Island, USA

Onne van der Wal / The Auckland Sky Tower at night, North Island, New Zealand.

Rick Tomlinson / Night time in Auckland, New Zealand.

Onne van der Wal / The Dutch Harbor Lighthouse off Jamestown, Rhode Island, USA. ^^^The tower was built in 1857 and is 42 feet high, the light has now been decommissioned.

Onne van der Wal / Auckland's Sky Tower, North Island, New Zealand

Roberto Rinaldi / Canal on Burano Island. The leaning tower of the San Martino church in the background, Italy.

Roberto Rinaldi / Canal on Burano Island. The leaning tower of the San Martino church is in the background, Italy.

Roberto Rinaldi / Canal on Burano Island. The leaning tower of the San Martino church in the background, Italy.

Michele Westmorland / Bell tower at the Brimstone Hill Fortress on the island of St. Kitts, Dutch Caribbean, Netherlands Antilles, West Indies. August 2006.

Roberto Rinaldi / The Comino Tower / Santa Maria Tower dominates the south-west part of the island Comino as well as the south Comino channel, Malta

Roberto Rinaldi / View of the bell tower (campanile) and monastery San Giorgio Maggiore. Masts of yachts moored in the island of San Giorgio's marina can be seen, Venice, Italy.

Tui De Roy / Nazca Booby (Sula granti) fledgling chick harassing incubating Frigatebird, Genovesa Tower Island, Galapagos Islands, Ecuador

Sue Flood / Scaffold tower for filming Beluga whales Someset Island Canadian arctic