The gestation period of Amur tigers, the world's largest big cat, is between 103 to 110 days.
Last year it was not other animals but a stuffed toy that was behind a big cat sighting.
Therefore, if they are really out there, someone, somewhere, should have come across a big cat corpse by now.
They spray deer musk in big cat enclosures, and freeze a polar bear's fish supper in blocks of ice.
"It depends on the individual, but if a big cat had escaped it only has a slim chance of survival, " he said.
No verifiable evidence for the presence of a "big cat" was found.
The number of big cat sightings reported to Devon and Cornwall Police has dropped from 28 in 2000 to four in 2012, latest figures show.
Norfolk Police are not strangers to reports of big cat sightings, with about 80 calls in the past seven years - mostly in rural areas.
Dairy farmer John Mathias said he found one of his calves dead with similar injuries and said he had seen the big cat on several occasions.
When a 14 year old boy found a big cat skull in a river in Bodmin Moor, it seemed certain to be proof the "Beast" was real.
However, the British Big Cat Society, (BBCS) said it had seen a "substantial increase" in reports over the past six years in the south west of England.
Tigers are more tricky, but for many big cat enthusiasts, it is the experience of seeing a jaguar in its natural environment that takes the top feline spot.
Howard Jackson sees a big cat in East Horsley Camping and Caravanning club site between the lake and the W. Boundary of the site, walking parallel to the feeder stream.
The case of the Monmouthshire boy attacked by a big cat as he played near his home is the latest in a long line of wild feline sightings in Wales.
Noted animal expert Jack Hanna said that even if Hanson knew the lion, a big cat can be unpredictable in the way it reacts to what it sees or hears.
"I have a colleague at London Zoo who was called out last year after the police spotted a 'big cat', only to find it was an ordinary ginger moggy, " he said.
The dresses, the shoes, the pinkish smell of perfume, the scratchy darkness, all pushed against me like the side of a big cat, thrust themselves into my mouth and nose like fur.
The big cat was a friendly one and rubbed against ye but it stayed in the front room all the time and was down by the window or else on grannie's bed.
Noted animal expert Jack Hanna said that even if the woman had known the lion, a big cat can be unpredictable in the way it reacts to what it sees or hears.
"Alien Big Cat" is the official term for a non-native, large cat, and refers to pumas and also to panthers, leopards, lynx, and any other big furry cat-like critter that is living wild.
In this story Pi must remain acutely aware of distance: the distance between him and the big cat, the restricted space of the lifeboat, and the overwhelming open horizons of the ocean all around him.
The blacksmith felt his organs clench as the first of the dogs, the bravely stupid, half-blind shepherd, reached the tiger and immediately went end over end as the big cat lashed at and then pinned him with all its enormous weight.
It is hard now to believe that in 1902 a tiger was shot under the billiard table (that the big cat emerged from a circus rather than virgin rain-forest, and was shot by a school headmaster, makes the story no less exotic).
On weekends, she volunteered at a big-cat sanctuary in Leaside, cleaning out the cages and playing with the baby lions.
Cold, disease, injury and the big-cat predators of Eurasia took their toll.
Big "cat-like" footprints were also found at the site, said police.
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