Mark MacEwen / Banded mongoose (Mungos mungo) juvenile sleeping on adult 'escort', Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Diane McAllister / Japanese Macaque (Macaca fuscata) juvenile riding on its mother's back, along snow trail in Jigokudani, Japan.

Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby carried in mother's mouth from the nest, Sante Fe, Argentina, February

Hiroya Minakuchi / Orca (Orcinus orca) mother and newborn baby with escort, Sea World, Kamogawa, Japan

Tony Wu / Humpback whale (Megaptera novaeangliae australis), male calf resting beneath his mother. Male escort visible in background. Vava'u, Tonga, South Pacific.

Tony Wu / Humpback whale (Megaptera novaeangliae) rear view of males escort, with adult female and male calf in the background. Vava'u, Tonga, South Pacific.

Tony Wu / Humpback whale (Megaptera novaeangliae) adult female in foreground, with her male calf and their escort behind her. Vava'u, Tonga, South Pacific.

Tony Wu / Humpback whale (Megaptera novaeangliae) male calf relaxing with his mother and an escort whale in the background. Vava'u, Tonga, South Pacific.

Tony Wu / Humpback whale (Megaptera novangliaea) male escort body blocking another male in pursuit of female, part of competitive group heat run, Vava'u, Tonga, South Pacific

Tony Wu / Humpback whale (Megaptera novaeangliae) female calf tail slapping at the ocean surface, playing with her mum and an escort, Vava'u, Tonga, South Pacific

Tony Wu / Humpback whale (Megaptera novaeangliae) male calf opening his mouth whilst playing with mother and escort, Vava'u, Tonga, South Pacific

Tony Wu / Humpback whale (Megaptera novaeangliae) male escort breaching, Vava'u, Tonga, South Pacific

Eric Baccega / Photographer Eric Baccega in salt desert with military escort required to travel in this region. Danakil Depression. Ethiopia, March 2015.

Mark MacEwen / Banded mongooses (Mungos mungo) youngster and adult 'escort' Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Mark MacEwen / Juvenile Banded mongoose (Mungos mungo) climbing on back of adult 'escort' Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Mark MacEwen / Juvenile Banded mongoose (Mungos mungo) with adult 'escort', Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Mark MacEwen / Juvenile Banded mongoose (Mungos mungo) asleep on adult 'escort', Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Mark MacEwen / Banded mongoose (Mungos mungo) adult 'escort' teaching young to forage, Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Mark MacEwen / Banded mongoose (Mungos mungo) young riding on back of adult 'escort', Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Benoit Stichelbaut / Escort vessel "Bystander", Concarneau, France, 2007

Loic Poidevin / Military escort with machine gun for salt caravans loaded with blocks of salt from Lake Karoum in the Danakil depression, Ethiopia, February 2009

Loic Poidevin / Machine gun belonging to military escort for salt caravans loaded with blocks of salt from Lake Karoum in the Danakil depression, Ethiopia, February 2009

Loic Poidevin / Military escort at Ahmed Ila village for travellers to Lake Karoum, Danakil depression, North Ethiopia, February 2009

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) female diving near cooperative male escort group, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 13846

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) female with male escort below, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 0753-1599

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Xiang Xiang, the first captive raised panda to be released into the wild with army escort, Wolong Nature Reserve, China

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary male escort, winner of the chase, stopped with female and other contenders in distance, Humpback Whale National Marine Sanctuary, Hawaii - notice must a...

Hiroya Minakuchi / Orca (Orcinus orca) mother and newborn calf with escort, Sea World, Kamogawa, Japan

Anup Shah / Banded mongoose {Mungos mungo} two pups compete for adult escort, Queen Elizabeth NP, Uganda

Anup Shah / Banded mongoose {Mungos mungo} pup asleep on back of adult escort, Queen Elizabeth NP, Uganda

Anup Shah / Banded mongoose {Mungos mungo} pup with adult escort, Queen Elizabeth NP, Uganda

Anup Shah / Banded mongoose {Mungos mungo} pup with adult escort, Queen Elizabeth NP, Uganda

Anup Shah / Banded mongoose {Mungos mungo} pup with adult escort, Queen Elizabeth NP, Uganda

Anup Shah / Banded mongoose {Mungos mungo} young pup with adult escort, Queen Elizabeth NP, Uganda

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow and calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) mother and calf with male escort in foreground, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort, male hopes to mate when female comes into estrus, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow and calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) calf, mother, and male escort, Maui, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) male escort and female, Humpback Whale National Marine Sanctuary, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 0753-1599

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary escort (top) courting female (below) Humpback Whale National Marine Sanctuary, Maui, Hawaii - notice must accompany publication; photo obtained under NM...

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary escort (top) courting female (below) Humpback Whale National Marine Sanctuary, Maui, Hawaii - notice must accompany publication; photo obtained under NM...

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) friendly cow, calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Mark Moffett / Researchers' military escort gets ice from bus while maintaining high speed, near the Afghan border, Iran

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and escort, Maui, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) friendly mother and calf followed by male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort followed by five other males, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Tui De Roy / Dugong (Dugong dugon) mother and calf and escort, Kai Islands, Maluku Islands, Indonesia

David Tipling / Common shelduck (Tadorna tadorna) pair escort creche of chicks across scrape, Cley Norfolk Wildlife Trust Reserve, North Norfolk, UK.

Doug Perrine / Aerial view of Humpback whales (Megaptera novaeangliae) competitive group with mother, calf, male escort, and challengers. Escort (center) is blowing bubble trail to intimidate challengers and separat...

Ralph Pace / Humpback Whale (Megaptera novaeangliae) calf surfacing with mother and escort below, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Doug Perrine / Humpback whales (Megaptera novaeangliae) female, with male escort following behind, , Hawaii Humpback Whale National Marine Sanctuary, Maui, Hawaii.

Mark Carwardine / Humpback whale (Megaptera novaeangliae), mother and calf with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf together with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf with male escort, aerial view. Baja California, Mexico. March.

Franco Banfi / Short-finned pilot whale (Globicephala macrorhynchus) male escort with female carrying her dead calf swimming nearby. South Tenerife, Canary Islands, Atlantic Ocean