Poisonous snakes, including killer cobras, are being kept on private land in Wakefield, Calderdale and Kirklees, an investigation has found.
Wakefield Metropolitan District Council recorded a rattlesnake, three cobras, one viper and eight ostriches being kept by private land owners, figures have revealed.
Calderdale Council recorded two rattlesnakes, two vipers, one puff adder and Kirklees Council recorded an Asian leopard cat and five hybrid Asian leopard cats.
Big cats including 13 tigers, two lions, eight leopards, seven cheetahs and nine pumas are also prowling behind the fences of addresses up and down the country.
Hundreds of poisonous snakes are also being kept, including more than 300 killer cobras, vipers and rattlesnakes.
And lurking beneath the waters of domestic enclosures are 10 alligators, nine crocodiles and 17 caimans - a smaller member of the crocodile family.
More than 100 councils have given people licences to keep a host of deadly predators, with some keeping a variety of different species at their homes.
Animal welfare experts condemned the findings, saying it was “deeply concerned” at the numbers and that animal welfare was being put at risk.
The data was obtained from Freedom of Information (FOI) requests sent to every council in the UK, of which 363 replied.
Dangerous wild animals (DWA) licences are granted by councils to allow people to keep undomesticated animals as pets, providing they have the requisite safety measures at their home and pay a small fee.
Among the more exotic areas is Cornwall, where the council has issued licences for pumas, lynxes, ocelots, lemurs, vipers, ostriches and an assortment of wild cats.
In Central Bedfordshire, meanwhile, wolves, alligators, caimans, black widow spiders, venomous snakes and short-clawed otters are being kept.
Among the most popular dangerous pets are lemurs, a small monkey, 115 of which are kept in domestic settings, while smaller cats, which are often crosses between domestic and larger wild cats, such as Savannahs, are also in high demand.
For those who prefer canine company, wolves are allowed under DWA licences, with 15 registered at UK addresses.
But DWA licences are also issued to properties where animals may be receiving care after being rescued, or living at small private farms, where people keep wild beasts for breeding purposes.
This means that as well as inhabiting garden enclosures, exotic wildlife also grazes on the greens of the British countryside, with 412 bison and more than 2,000 wild boar living in private fields, along with a score of zebras.
The RSPCA said it was concerned that licences too often focus on protecting the public from harm, rather than on the well-being of the animals themselves.
A spokeswoman said: “We are deeply concerned about the number of exotic animals, including dangerous wild animals, now being kept as pets. People may buy them with little idea of how difficult they can be to keep and the animals are sometimes neglected when the novelty wears off and the commitment hits home. This is why we would encourage anyone thinking of getting an exotic pet to find out as much as possible about the animal’s needs and whether they’re a realistic pet.”
She added: “Licences for exotic animals classed as Dangerous Wild Animals - such as cobras, ostriches and caiman crocodiles - are granted by local authorities and the details are also held locally. There is no centrally-held list to determine how many are kept across the country. The emphasis of this legislation is on making sure the owner takes reasonable steps to prevent the animal from being a threat to the public, rather than the welfare of the animals concerned.
“Exotic animals have specialist needs and this includes the ones listed on the Dangerous Wild Animals Act list.”