Bodies of dead ISIS fighters are being eaten by wild dogs in Mosul

(Daily Mail)- These chilling pictures inside newly-liberated eastern Mosul show the bodies of dead ISIS fighters laying rotting in the streets. 

On the banks of the Tigris River, just 600 metres from active ISIS positions, waste water trickles around a militant's corpse, lying rotting in a sewage outlet. 

He was one of many killed by Iraq's Special Forces as they advanced through rural suburbs towards the riverbank, forcing ISIS fighters to flee by boat across the Tigris to western Mosul - the other half of the city still occupied by ISIS.

In a nearby field, a soldier points out chickens pecking over a bloated and bloodied ISIS soldier. 

'They are hungry because the farmers left when the fighting started and they have no food,' he said. 'But those chickens are eating ISIS and then someone will eat them. It's disgusting. I've stopped eating chicken.' 

Across the city, its normally emaciated wild dogs look healthier as they are living on a diet of dead extremists. 

In one district where many buildings were reduced to rubble by coalition airstrikes, a litter of plump puppies waddle around the grounds of a bombed-out mosque, metres from two decomposing corpses.

Torn-open wounds on the bodies show the puppies have been eating the head and face of one militant and the abdomen of the man next to him.

'Let the dogs eat them, we don't care. Actually, we feel quite happy when we see dogs eating terrorists,' said army soldier Khalid.

'This is a normal death for every terrorist who comes to Iraq - they will be eaten by dogs.' 

He insisted responsibility to remove the corpses is down to the council, rather than the army.

'They've been there over a week,' one resident told MailOnline. 'Their car was targeted by a helicopter, so they escaped and ran towards that mosque, but then the aircraft bombed it and killed them.'

Khalid claimed the mosque was being used as an ISIS base, where it was rumoured ISIS leader Abu Bakr al-Baghdadi had preached.

Another soldier, Ashraf, said leaving the bodies in the street served as a warning to ISIS fighters and supporters, who have many claim since the city's liberation, have shaved their beards and cut their hair to disguise themselves and are hiding amongst civilians. 

A number of rogue ISIS soldiers have been discovered hiding in underground tunnels and on rooftops in newly-liberated areas before they have been executed.

In another district, Federal Police Sergeant Mahmoud, 34, pointed at the dead body of a young man looking no older than 15 years old, too young to have even grown a proper beard, lying on the edge of a town square. 

'He killed a policeman,' explained Sergeant Mahmoud. 'A civilian reported that there was an ISIS fighter hiding on the roof of their house and, when a policeman went up there to investigate, the ISIS guy shot him in the chest and leg, killing him.'

Federal Police units, which are moving into positions behind the advancing Iraqi Army, to secure Mosul's newly-liberated areas, killed him.

His body was dragged through the streets and tied to a lamppost using pink plastic hose pipe with his feet bound together by blue twining

'We dragged him here and hanged him from that post for a few hours, so everyone could see what happens to you if you are ISIS,' Sergeant Mahmoud said. 

'Maybe it seems weird but I see it as revenge because that's what ISIS themselves did to people in Mosul.' 

'What we did with the body is okay because any ISIS people still in hiding will know they should be scared, thinking the same thing could happen to them,' he added.

As Sergeant Mohmoud explains the barbaric torture of slain extremists, children a few years younger than the dead militant, play nearby with pieces of scrap metal. 

'He's a dirty man and he stinks,' said 13 year-old Ali, orphaned after ISIS killed his parents a year ago. 'I feel a bit sick when I look at him but he's an ISIS and ISIS want to destroy the world.'

Ali said his is looking forward to the city's schools reopening. In Mosul's ISIS-controlled schools children were taught using textbooks with a gun symbol printed on every page.

'I hated school with ISIS,' explained 11-year-old Mohammed. 'They had their own school books which had a drawing of a Kalashnikov on every page, and they were full of pictures of RPGs and bombs.' 

Mohammed said many children stopped going when teachers pressured them to attend ISIS-run mosques after class.

Another boy, Ra'ad, 14, described how he and his friends could only endure chilling ISIS tuition for three days.

'On the first day, they gave us picture books for maths and the sums were: 'One bullet plus two bullets equals three bullets, and one suicide bomber plus five suicide bombers equals six suicide bombers',' he recalled. 

'On the second day we were shown a range of weapons. We were taught how to strip-down, clean and reassemble guns. Then they we were taught how to shoot.'

He added: 'On the third day, they brought dolls and knives and showed us how to cut the heads off the dolls. That was really awful, especially because, when we made fun of it and laughed at the dolls, they hit us. After that horrible day, we didn't go back to school again.'

Most of Mosul's children spent the last two and half years staying at home, playing in the street or working with their fathers. But even then, they were still not immune from the terrifying reign of ISIS. 

Abdul, 15, worked with his father selling cigarettes, a high-risk but lucrative illegal trade in Mosul. Across ISIS's self-proclaimed caliphate, smoking is banned and punishable by public lashings. 

'The first time they caught me, they whipped me 36 times with a cow's tail,' said Abdul. The second time, he and his father were thrown into jail. 'There, with my own eyes, I saw them pour fuel over one man and on the ground around him, before setting it alight,' he said. 'It was terrible. We could hear his screams as he was burning to death.'

Across Mosul, the legacy of ISIS' reign of terror is evident everywhere. ISIS murals are still daubed across walls, proclaiming that militants are heading to Rome and threatening locals with death if they didn't pay 'zakat', an Islamic tax intended for charities. 

Outside nursery schools and in a central Mosul amusement park, cartoon characters have their faces sprayed over viewed as haram and forbidden by ISIS.

Iraq's armed forces launched the offensive to retake Mosul in October and recently announced the liberation of the eastern side of the city. 

They are planning a fresh offensive to western Mosul, on the other bank of the Tigris River.