Sherman, the overweight hedgehog, sits in his cage at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sits in his cage at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sniffles leaves at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sits in his cage at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sits behind a plant at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sits on top of a scale displaying the weight of 1477 grams (3.26 lbs) at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Sherman, the overweight hedgehog, sits in his cage at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Zoo worker holds Sherman, the overweight hedgehog, at the Ramat Gan Safari Zoo, near Tel Aviv, Israel January 3, 2018. REUTERS/ Amir Cohen 

Hedgehogs sit in a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A staff member (L) takes a hedgehog from a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A board shows a selection of hedgehogs for sale at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. Prices are shown in yen. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A hedgehog walks next to a mobile phone with a hedgehog cover at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

A woman holds a hedgehog at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

Hedgehogs sit in a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Hedgehogs sit in a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

A woman takes a selfie with a hedgehog at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Anna (C), 11, and Yuna Cheung (R), 11, from Great Britain hold hedgehogs as their mother Kimberly Russel watches at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

A woman holds a hedgehog at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

A hedgehog stands up in a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

A woman holds a hedgehog at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

A hedgehog sits in a glass enclosure at the Harry hedgehog cafe in Tokyo, Japan, April 5, 2016. In a new animal-themed cafe, 20 to 30 hedgehogs of different breeds scrabble and snooze in glass tanks in Tokyo's Roppongi entertainment district. Customers have been queuing to play with the prickly mammals, which have long been sold in Japan as pets. The cafe's name Harry alludes to the Japanese word for hedgehog, harinezumi. REUTERS/Thomas Peter SEARCH "HEDGEHOG THOMAS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

A hedgehog walks across grass in Pitlochry, Scotland, August 11, 2015. REUTERS/Russell Cheyne 

A hedgehog walks across grass in Pitlochry, Scotland, August 11, 2015. REUTERS/Russell Cheyne 

A hedgehog wearing a bridal veil is seen next to another after making a paw print on a symbolic pets wedding certificate during Valentine's Day celebrations organized by a local municipality in Lima February 14, 2015. REUTERS/Enrique Castro-Mendivil (PERU - Tags: SOCIETY ANIMALS) 

A figure of a drumming hedgehog with a picture of Renate Kuenast, German Green party's Berlin mayoral candidate, stands on a delegates table during a party meeting in the south-western German city of Freiburg November 21, 2010. Kuenast was nominated by the Green party's Berlin regional association to run for the office of Berlin mayor. REUTERS/Ralph Orlowski (GERMANY - Tags: POLITICS ENVIRONMENT) 

A two-month old hedgehog is carried in a garden where it was found last week, in Gelsenkirchen October 6, 2009. Wild hedgehogs generally hibernate from November to March. REUTERS/Ina Fassbender (GERMANY ANIMALS ENVIRONMENT SOCIETY IMAGES OF THE DAY) 

Five two-months old hedgehogs eat cat food in a garden where they were found last week, in Gelsenkirchen October 6, 2009. Wild hedgehogs generally hibernate from November to March. REUTERS/Ina Fassbender (GERMANY ANIMALS ENVIRONMENT SOCIETY) 

An echidna, native to Australia, casts a shadow as it walks over a track in
Sydney's Taronga Zoo August 4, 2003. Scientists say that the echidna, which
has been called a 'freak of nature', has often been the victim of mistaken
identity with the hedgehog and North American spiny porcupine but is in fact
one of the world's clearest examples of Convergent evolution - the emergence
of chance look-alikes. FOR RELEASE WITH FEATURE
BC-SCIENCE-AUSTRALIA-HEDGEHOGS REUTERS/David Gray

DG/DL 

An echidna, native to Australia, is held by it's keeper at Sydney's Taronga
Zoo August 4, 2003. Scientists say that the echidna, which has been called a
'freak of nature', has often been the victim of mistaken identity with the
hedgehog and North American spiny porcupine but is in fact one of the
world's clearest examples of Convergent evolution-the emergence of chance
look-alikes. FOR RELEASE WITH FEATURE
BC-SCIENCE-AUSTRALIA-HEDGEHOGS REUTERS/David Gray

DG/CP 

"Pickles", a female Hedgehog in the Wildlife Gardens of the Natural History Museum in London August 13. The museum has launched the Garden Mammal Survey, to discover where Britain's mammals are going when their natural woodland and hedgerow habitats are destroyed.

IW