Clay Bolt / Composite image of Wallace's giant bee (Megachile pluto) with European honey bee (Apis melifera). This is the world's largest bee, which is approximately 4 times larger than a European honey bee. One...

Simon Colmer / Green-veined White butterfly egg (Pieris napi) above, Orange-tip butterfly egg (Anthocharis cardamines) below, on Garlic mustard (Alliaria petiolata) Sussex, UK. June.

Juergen Freund / Dugong (Dugong dugon) in the seagrass bed shadowed by a trevally. Dimakya Island, Palawan, Philippines

Yashpal Rathore / African elephant (Loxodonta africana) and Warthog (Phacochoerus africanus) waiting near waterhole. Savuti, Chobe National Park, Botswana.

Ingo Arndt / Hummingbird (Trochilidae) egg and Ostrich (Struthio camelus) egg, a size comparison of eggs of world's smallest and largest extant birds. Senckenberg Museum, Frankfurt, Germany.

Chase Dekker / Blue Whale (Balaenoptera musculus) pair and whale watching boat, Monterey Bay, California

Karine Aigner / Nano - transmitters and the 'back pack' made by scientist Nathan Cooper, in comparison, next to a dime. Used for research into migration and behaviour of Kirtland's warblers.

Emanuele Biggi / Weaver ants (Oecophylla smaragdina) major and minor workers, Malaysian Borneo.

Daniel Heuclin / Man holding a large Goliath frog (Conraua goliath) and small Banana frog (Afrixalus sp) for size comparison, Sanaga, Cameroon. Hunted for bushmeat / food

MYN / Clay Bolt / Carpenter bee (Xylocopa virginica) next to a Small carpenter bee (Ceratina), South Carolina, USA. Composited image. Meetyourneighbours.net project

Will Watson / Male Palmate newt (Lissotriton helveticus), Smooth newt (Lissotriton vulgaris) and Great crested newt (Triturus cristatus) held in the hand for size comparison, following bottle trapping, captured fro...

Yva Momatiuk & John Eastcott / African Elephant (Loxodonta africana) and Impala (Aepyceros melampus), Etosha National Park, Namibia

Gabriel Rojo / Lake duck (Oxyura vittata), male and Coscoroba swan, (Coscoroba coscoroba), La Pampa, Argentina

Laurent Geslin / Millipede (Myriapoda) on grass blade, with African elephant (Loxodonta africana) in background Masai Mara National Park, Kenya.

Laurent Geslin / Fruit beetle (Pachnoda) on leaf, with African elephant (Loxonta africana) in distance, Masai Mara, Kenya.

Suzi Eszterhas / California sea lion (Zalophus californianus) juvenile amongst adults, Monterey Bay, California, USA, June.

Steve O. Taylor (GHF) / San rock paintings with man for size comparison, Matobo Hills, Zimbabwe. January 2011.

Nick Garbutt / Colombian Purple Bloom Tarantula (Xenesthis immanis) with human hand for scale (leg span 22-23cm). Paujil Nature Reserve, Magdalena Valley, Colombia, South America.

Rolf Nussbaumer / Sword-billed Hummingbird (Ensifera ensifera) male feeding from passionflower (Passiflora mixta), Papallacta, Ecuador, Andes, South America. January.

Chris Shields / Illustration of extinct Mega Penguin (Palaeeudyptes klekowskii) with human and Emperor penguin (Aptenodytes forsteri) for scale. Mega Penguins were the largest and heaviest penguins ever,with this spe...

Solvin Zankl / Female Toothed seadevil (Neoceratias spinifer) with male attached, captive from deep sea.

Chris & Monique Fallows / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor) Cape Point, South Africa

Richard Du Toit / Ostrich (Struthio camelus) towering above small chicks, Kgalagadi Transfrontier Park, South Africa

MYN / Andrew Snyder / Amazon clawed gecko (Pseudogonatodes guianensis) on Guyanan 5 dollar coin for size comparison, Iwokrama, Guyana. Meetyourneighbours.net project

Tim Laman / Paradise Riflebird (Ptiloris paradiseus) young males size each other up between practice displays. Australia

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) breath-holding male and female filmed by Jason Sturgis, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 13846

Mark Carwardine / Aerial view of adult female Blue whale (Balaenoptera musculus) with research boat (7m long), Sea of Cortez (Gulf of California), Baja California, Mexico (Pacific coast), Endangered species

Mark Carwardine / Ostrich egg {Struthio camelus} with chicken egg for size comparison

Mark Carwardine / Aerial view of Southern right whales + whale watching boat, South Africa {Balaena glacialis australis}

Mark Carwardine / Aerial view of whale watching boat and Blue whale, Sea of Cortez, Mexico

Mark Carwardine / Aerial view of whale watching boat and Blue whale + calf, Sea of Cortez, Mexico

Mark Carwardine / Comparison of teeth of Great white shark and extinct Megalodon, Malta

MYN / Carsten Krieger / Common limpet (Patella vulgata) large and small shell, County Clare, Republic of Ireland. meetyourneighbours.net project

Jeff Rotman / Diver examines Giant Gurney's sea pen (Ptilosarcus gurneyi) British Columbia, Canada, North Pacific Model released.

Jeff Rotman / Scientist holding a poisonous Pacific blue-ringed octopus (Hapalochlaena maculosa) in his hand. The octopus can emmit a fatal neurotoxin through it's saliva when provoked, and there is no known anti-v...

Nature Production / Comparison of size of eggs of Domestic Chicken (Gallus domesticus) and Ostrich (Struthio camelus), Tobu Zoo, Saitama, Japan

Juergen Freund / Massive plate coral with diver for scale, North Sulawesi, Indonesia.

Donald M. Jones / Black Bear (Ursus americanus) scat with pen for size comparison, North America

Jouan & Rius / Ground chameleon (Brookesia minima) in tropical rainforest, Montagne dAmbre NP, Madagascar

Petra Wegner / Cavalier King Charles Spaniel, one-year-old with 8- weeks puppy, ruby, half-brothers

Jerry Monkman / Short-billed dowitcher {Limnodromus griseus} (front) and Willet {Catoptrophorus semipalmatus} roosting, Fort De Soto Park, Florida, USA. Winter plumage.

Fabio Liverani / Man beside huge buttress roots of rainforest tree, Tambopata National reserve, Amazonia, Peru

Jouan & Rius / Buttress roots of giant tree with man for size comparison, Tortuguero NP, Costa Rica

Shattil & Rozinski / Camel beside Step pyramid of Zoser, Saqqarah, Egypt, 1989

Shattil & Rozinski / Grey wolf footprint {Canis lupus} beside man's hand for size comparison, Alaska, USA

Martin Gabriel / Baobab tree {Adansonia digitata} with three people hugging the trunk, Epupa Falls, Kaokoveld, Namibia

Pete Oxford / Child looking at Galapagos Giant Tortoise {Geochelone elephantophus porteri} Highlands of Santa Cruz Is, Galapagos 2006

Pete Oxford / Tourist and Galapagos Giant Tortoise {Geochelone elephantophus porteri} Highlands of Santa Cruz Is, Galapagos 2006

Tony Phelps / Rain spider {Palystes} beside hand to show large size, Little Karoo, South Africa

Pete Oxford / Mahafaly people beside giant trunk of Baobab tree (Adansonia za) Near Ampanihy, south-west coast of MADAGASCAR. 2005

Pete Oxford / Mahafaly people beside giant trunk of Baobab tree (Adansonia za) Near Ampanihy, south-west coast of MADAGASCAR. 2005

Pete Oxford / Giant armoured cockroach (Gromphadorhina sp?) Lake Tsimanampetsotsa soda lake, Tsimanampetstsa National Park, SW MADAGASCAR 2005

Nature Production / Two Pygmy Marmosets {Cebuella pygmaea} on a man's finger, captive

Shattil & Rozinski / Anna's hummingbird {Calypte anna} eggs in nest with Domestic chicken egg for size comparison, USA

Fabio Liverani / Common European toad juvenile on human finger {Bufo bufo} Italy

Jabruson / Western lowland gorilla {Gorilla gorilla gorilla} Male silverback with female and juveniles, Maya Maya Bai, Odzala NP, Congo Rep

Michael Hutchinson / Man beside three trunked Coast Giant redwood tree {Sequoia sempervirens} Prairie Crekk Park, California, USA

Michael Hutchinson / Man beside three trunked Coast Giant redwood tree {Sequoia sempervirens} Prairie Crekk Park, California, USA

Simon Colmer / Great Crested Newt (Triturus cristatus) male in breeding colours with Palmate newt (Triturus helveticus) near tail showing size difference, Captive

Patricio Robles Gil / Large tropical tree trunk with man for size comparison, Mikongo tropical forest, Gabon

Juergen Freund / Spanish dancer {Hexabranchus sanguineus} on a divers hand, Indo-Pacific

Doug Perrine / Comparison of tooth of Great white shark and fossil tooth of {Carchardon megalodon}, extinct

Staffan Widstrand / Human hand beside European Grey wolf track {Canis lupus} Sweden.

Pete Cairns / Footprint of Grey wolf {Canis lupus} alongside human hand print, Katmai, Alaska.

Daniel Gomez / Carpenter ant {Camponotus sp.} help in hand for size comparison. Brunei, Borneo.

Nick Turner / Buttress roots of Nakatambol tree, Vanuata, Micronesia {Dracontomelon vitiense}

Jane Burton / Ostrich {Struthio camelus} egg compared to a domestic hens egg. UK.

Phil Savoie / Smaller Viceroy butterfly mimics larger poisonous Monarch butterfly for defence

Juergen Freund / Diver with Potato grouper / cod {Epinephelus tukula} Great Barrier Reef, Queensland, Australia

Juergen Freund / Diver with Potato grouper / cod {Epinephelus tukula} Great Barrier Reef, Queensland, Australia

Juergen Freund / Diver with Atlantic spotted dolphin {Stenella frontalis} Atlantic, Bahamas

Chase Dekker / Blue Whale (Balaenoptera musculus) and whale watching boat, Monterey Bay, California

Chase Dekker / Blue Whale (Balaenoptera musculus) near whale watching boat, Monterey Bay, California

Chase Dekker / Blue Whale (Balaenoptera musculus) near whale watching boat, Monterey Bay, California

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) and juvenile, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) and juvenile grazing, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Ingo Arndt / Peacock chameleon {Chamaeleo wiedersheimii} on matchstick

Yva Momatiuk & John Eastcott / Angolan Giraffe (Giraffa giraffa angolensis) pair scaring Springbok (Antidorcas marsupialis) from waterhole in dry season, Etosha National Park, Namibia

ZSSD / Ant (Formicidae) soldier and worker, distributed worldwide

Paul D Stewart / Elephant bird egg (Aepyornis maximus) 30cm compared to a Calliope hummingbird egg (Stellula calliope) 12mm. The Aepyornis egg volume holds around 7 to 10 litres, the hummingbird's a few millilitres. T...

Petra Wegner / Cavalier King Charles Spaniel, one-year-old with 8- weeks puppy, ruby, half-brothers

Petra Wegner / Cavalier King Charles Spaniel, one-year-old with 8- weeks puppy, ruby, half-brothers

Premaphotos / Spring peeper frog (Pseudacris / Hyla crucifer) sitting on a finger to show how tiny it is, South Carolina, USA

Nature Production / Diver with Nomura's / Sand Jellyfish {Nemopilema nomurai} swimming sideways, Oki, Shimane, Japan

Nature Production / Tiny Leaf Chameleon {Brookesia minima} on a finger, the smallest reptile, captive, occurs Madagascar

Miles Barton / 4 month old Aldabra giant tortoise beside adult {Geochelone gigantea} Seychelles

Lewis Jefferies / Stage 2, planktonic European lobster (Homarus gammarus) hatchling, next to a 1p piece for scale. National Lobster Hatchery, Padstow, Cornwall, UK. November, 2018.

Ross Hoddinott / Small fungi dwarfed by larger mushroom, Bolderwood, The New Forest, Hampshire, UK. November.

Roland Seitre / Budgerigar (Melopsittacus undulatus) comparison between two adult males, with wild variety on the right and domestic variety on the left.

Nick Garbutt / Egg size comparison to scale: extinct Elephant bird (Aepyornis maximus) - shell reconstructed from fragments found in dry river beds in southern Madagascar -, Common ostrich (Struthio camelus) and D...

Nick Garbutt / Egg size comparison to scale: extinct Elephant bird (Aepyornis maximus) - shell reconstructed from fragments found in dry river beds in southern Madagascar - and Common ostrich (Struthio camelus). Pho...

Nick Garbutt / Egg size comparison to scale: extinct Elephant bird (Aepyornis maximus) and Common ostrich (Struthio camelus). Photographed with multiple flash set up.

Rolf Nussbaumer / Giant sequoia (Sequoiadendron giganteum) in forest, shadow of person dwarfed by tree projected on the tree trunk. Sequoia and Kings Canyon National Park, California, USA. October.

Pascal Kobeh / Sperm whale (Physeter macrocephalus) sleeping vertically next to diver, diver dwarfed by whale. Mauritius. 2019.

Nick Garbutt / Madame Berthe's mouse lemur (Microcebus berthae) left, world's smallest primate, and Grey mouse lemur (Microcebus murinus) right, held in hand for comparison. Kirindy forest, western Madagasca...