A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A rare baby spider monkey is held by its mother as is shown to the public for the first time at the Decin Zoo in Decin, Czech Republic, November 19, 2019. REUTERS/David W Cerny

A newborn albino red-necked wallaby joey is carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny TPX IMAGES OF THE DAY

A common squirrel monkey looks out of its enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A stork is pictured in its enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

A newly born albino red-necked wallaby joey is being carried by its mother in their enclosure at the zoo in Decin, Czech Republic, March 13, 2019. REUTERS/David W Cerny

People in canoes visit one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

A woman walks her dog past one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

People in canoes visit one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

A child stands on one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

People in canoes visit one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

People in canoes visit one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

The director of the Regional Museum, Vlastimil Pazourek (R) stands next to one of the 'hunger stones' revealed by the low level of water in the Elbe River in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

One of the 'hunger stones' revealed by the low level of water in the Elbe River is seen in Decin, Czech Republic, August 29, 2018. REUTERS/David W Cerny

Players enter the "Grand Stade", the new Olympique Lyon's stadium, to play their first match against Troyes, in Decines near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

A general view shows the "Grand Stade", the new Olympique Lyon's stadium during its official inauguration in Decines, near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

A general view shows the "Grand Stade", the new Olympique Lyon's stadium during its official inauguration in Decines near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

Jean-Michel Aulas (centre R), Chairman of Olympique Lyon soccer team and owner of the new Grand Stade, and Gerard Collomb (centre L), mayor of Lyon, participate in a ribbon cutting ceremony during the official inauguration of the Grand Stade in Decines near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10 to July 10. REUTERS/Robert Pratta

Jean-Michel Aulas, Chairman of Olympique Lyon soccer team and owner of the new Grand Stade, and Gerard Collomb, mayor of Lyon, participate in a ribbon cutting ceremony during the official inauguration of the Grand Stade in Decines near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10 to July 10. REUTERS/Robert Pratta

Jean-Michel Aulas, Chairman of Olympique Lyon soccer team and owner of the new Grand Stade, and Gerard Collomb, mayor of Lyon, participate in a ribbon cutting ceremony during the official inauguration of the Grand Stade in Decines near Lyon, France, January 9, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10 to July 10. REUTERS/Robert Pratta

An interior view shows the seats at the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, January 7, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

Journalists work during a press visit at the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, January 7, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

An interior view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, January 7, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

An interior view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, January 7, 2016. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

A view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, December 17, 2015. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

An interior view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, December 17, 2015. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

Workers are seen on the roof of the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, December 17, 2015. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

A view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, December 17, 2015. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

An interior view shows the "Grand Stade", the new Olympique Lyon's stadium in Decines near Lyon, France, December 17, 2015. Lyon is one of the ten host cities for the Euro 2016 soccer finals that will be played from June 10, 2016 to July 10. REUTERS/Robert Pratta

A volunteer releases salmon fry into the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

A salmon fry swims in a ladle as it is released into the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT TPX IMAGES OF THE DAY)

A volunteer releases salmon fry into the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers release salmon fry into the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers carrying buckets containing salmon fry walk through the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers carrying buckets contining salmon fry walk through the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers carrying buckets containing salmon fry walk towards the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers carrying buckets containing salmon fry walk through the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

A fishermen takes out salmon fry from an oxygen bag near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers carrying buckets containing salmon fry walk through woods towards the Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers line up as oxygen bags containing salmon fry sit in the water to acclimatize to the temperature of Kamenice river near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

Volunteers line up as fishermen take out salmon fry from oxygen bags near the village of Jetrichovice October 22, 2013. Members of Czech Fishing Union and Bohemian Switzerland National Park release salmon every year to Kamenice river as part of the reintroduction programme kicked-off in 1998. The programme is aimed at stabilising the salmon population in the Czech Republic and at reintroducing the fish to rivers after almost 50 years of absence caused by massive industrial pollution during the communist era. Picture taken October 22, 2013. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: ANIMALS ENVIRONMENT)

A firefighter rests as he looks down at flood water from Labe River in Decin June 5, 2013. Tens of thousands of Germans, Hungarians and Czechs were evacuated from their homes on Wednesday as soldiers raced to pile up sandbags to hold back rising waters in the region's worst floods in a decade. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: DISASTER ENVIRONMENT)

A firefighter checks a water pump in Decin June 5, 2013. Tens of thousands of Germans, Hungarians and Czechs were evacuated from their homes on Wednesday as soldiers raced to pile up sandbags to hold back rising waters in the region's worst floods in a decade. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: DISASTER ENVIRONMENT)