One animal whose sex life has come in for close scrutiny is the wombat.
If they're right, this means the cancer is literally jumping from one animal to the other, much like a parasite.
And crucially, like polio, smallpox had only one animal host: Homo sapiens.
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At least one animal is believed to have died while foaling and many others were extremely emaciated, the Bodmin Moor Commoners' Association said.
"It was like being put in a cage made for one animal and then getting two or three other people in, " he told BBC News.
But while members can report movements of any wildlife whilst scanning the open savannah, there is one animal whose whereabouts is banned from the site.
On this first day of spring, one animal rights group is urging people to use the occasion of a fresh start, a brand new season, to give up eating meat.
"If the life of one animal may endanger other lives or human lives as well, then we must take into account the greater good and sacrifice the individual good, " he said.
Then in April the plight of one animal captured the imagination of the public when Phoenix the calf was spared from the cull on a Devon farm after surviving for five days under a mound of slaughtered cattle.
On epidemiologists' standard assumption that every individual counts, vaccination programmes are intended to prevent epidemics by ensuring that each infected animal, on average, passes the disease on to less than one healthy animal.
"It's one at a time, and it's fairly slow work, " said Michael Mountain, president and CEO of Best Friends Animal Society, one of the first animal organizations allowed into the city to rescue pets.
Readers were quick to point out that weres can only turn into one type of animal, while shape-shifters can take any animal form.
Mr Aspinall's interview came after a zookeeper was killed earlier this week by an elephant at one the wild animal parks he owns.
Occasionally, one of these animal viruses is able to jump into humans - either directly or through an intermediate host, such as a chicken or a swine.
Researchers outfitted rats with goggles that flashed a light in one of the animal's eyes to signal the rat to lick a spout in order to receive a drop of water.
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The mosquito bites one person or animal with malaria, takes the parasite on board, flies off to another victim, bites and implants the parasite, which proceeds to multiply like crazy, sickening if not killing its victims.
Mononoke despises humans because she has never found one who treats her animal friends kindly.
Pembrokeshire council said one of its senior animal health officers had visited Great Redford Farm near Narberth on 18 November and examined a carcass.
They were one of the first animal research projects to use DNA finger-printing techniques in wild animals so as to understand the relationships within a pride.
The former social worker has an office on Fifth Avenue, where clients can stop by and plop themselves down on one of her plush animal-print chairs.
And is it not equally absurd that we should not have heard outrage about this from PETA and from every other one of the rabid animal rights groups?
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Czech food regulator SVS said on Monday it had found undisclosed amounts of the animal in one specific batch of meatballs during a routine check late last week.
There was a case to be made for Djokovic going into the final, not least because he had defeated five-time champion Roger Federer in a dramatic semi-final and had a 7-3 record against Nadal on hard courts, but the world number one is a different animal in major finals.
AN-1792 may be one more piece of evidence that promising animal studies do not always produce treatments for humans as quickly as one might hope.
Both faiths put great emphasis on animal welfare, and adhere to a one-cut method of slaughter, intended to ensure the animal's rapid death.
He sees a sleek black animal run from one field, across a dirt road into another field.
Buck was beaten regularly and unmercifully as a boy, broken in ways no one would wish on any animal.
The opening session talked less of goslings and rooks than of an animal that was one of Tinbergen's favourite toys the three-spined stickleback.
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