Catastrophe

We may have been prevented from ringing for over two months but there are still Linnets in circulation from earlier catches, birds that at later dates might deliver all manner of information. We received notification of one such individual. 

It was 12 September 2021 along the Pilling/Cockerham coast that I ringed Linnet number AKN3729 as a juvenile/first autumn male. This was one of 7 Linnets caught that morning before I signed off for a two week holiday to Sunny Greece.  

A few months later Linnet AKN3729 was recaptured on 30 January 2022, inland and almost due south at Fogg's Farm, Antrobus, Cheshire by members of Merseyside Ring Group; they were able to work their Fogg’s Farm site as normal while our own ringing was stalled because of avian flu. 

Linnet - Cockerham, Lancashire - Antrobus, Cheshire

Linnet

Juvenile Linnets are known to disperse in a south and south westerly direction during the autumn period, some as far as France and Spain. We have no further sighting of AKN3792 so both its origins and eventual destination are unknown but the bird remains in circulation to provide more clues should it be found again.  

Another recovery was more predictable – that of one of our ringed birds taken by a domestic cat. 

A young female Greenfinch Ring number NF87535 ringed at Cockerham on 15 October 2021 was found freshly dead, taken by a cat, just 18 kms away, at Staining, Blackpool on 4 February 2022. 

Greenfinch

 

Wonderly’s photo, “Caught by Cats,” recently won first place in the 2020 Big Picture Natural World Photography Competition’s Human/Nature category. His image highlights a grim picture. 

Cat Kill - National Geographic

The photo would need to be multiplied 10 million times to come close to showing the billions of animals killed by cats each year. 

A 2013 study estimated free-ranging domestic cats kill between 1.3 and 4 billion birds - on top of between 6.2 and 22.3 billion mammals every year in the United States alone, the majority by feral or unowned cats. 

Figures released by the Mammal Society show the UK's estimates for domestic cat kills to be equally shocking: around 100 million prey items between Spring and Summer, of which 27 million were birds - and that’s not counting the creatures the cats didn't bring home. 

But, according to the UK Royal Society for the Protection of Birds (RSPB), there is no scientific evidence to link cats to bird population decline in the UK. I for one do not believe that, perhaps because RSPB members are also likely to be cat lovers? 

The message is simple. Cat Lovers should not let their cat roam in the countryside, even in their own or neighbours’ garden where birds may feed. 

And do not feed feral cats. Such kindness may be doing more harm than good. 

Linking today to Eileen's Blogspot and Anni in Texas.

 

The Rats Are Winning.

Grotty weather again today, so nothing doing in the birding or ringing stakes.

Instead, here’s an interesting study on cats versus rats. Cat lovers and bird lovers rarely agree, but in this case it seems that pussy cats are not the ultimate rat catchers but prefer instead to eat a bird or a mouse. 

Pussy Cat

Journal Reference: Michael H. Parsons, Peter B. Banks, Michael A. Deutsch, Jason Munshi-South. Temporal and Space-Use Changes by Rats in Response to Predation by Feral Cats in an Urban Ecosystem - Frontiers in Ecology and Evolution, 2018. 

"Like any prey, rats overestimate the risks of predation. In the presence of cats, they adjust their behaviour to make themselves less apparent and spend more time in burrows," says the study's lead researcher Dr. Michael H. Parsons, a visiting scholar at Fordham University. "This raises questions about whether releasing cats in the city to control rats is worth the risks cats pose to wildlife." 

People have long associated cats as the natural enemy of rats. However Australian and US researchers say cats prefer smaller, defenceless prey such as birds and smaller native wildlife -- which makes cats a threat to urban ecosystems. 

"New Yorkers often boast their rats 'aren't afraid of anything' and are the 'size of a cat'," says Parsons. "Yet cats are commonly released to control this relatively large, defensive and potentially dangerous prey." 

Brown Rats

"Until now, no one has provided good data on the number of city rats killed by cats," adds co-author Michael A. Deutsch, from Arrow Exterminating Company.  "But the data have been very clear as to the effect of cats on native wildlife." 

When feral cats invaded a New York City waste recycling centre, the researchers took the opportunity to correct the record. Their team was already studying a colony of more than 100 rats living inside the centre, by microchipping and releasing the animals to study their life history. When the cats entered the research area, they set up motion-capture video cameras to quantify the effect of the cats on the rats -- the first time this has been studied in a natural setting. 

"We wanted to know whether the number of cats present would influence the number of rats observed, and vice versa," says Parsons. "We were also interested whether the presence of cats had any effect on eight common rat behaviours or their direction of movement." 

The researchers examined 306 videos taken over 79 days. Although up to three cats were active beside the rat colony each day, only 20 stalking events, three kill attempts and two successful kills were recorded in this time. Both kills took place when cats found rats in hiding; the third attempt was an open-floor chase where the cat lost interest. 

The videos also revealed that in the presence of cats, the rats spent less time in the open and more time moving to shelter. "The presence of cats resulted in fewer rat sightings on the same or following day, while the presence of humans did not affect rat sightings," says Parsons. In contrast, the number of rats seen on a given day did not predict the number of cats seen on the following day. 

"We already knew the average weight of the rats was 330 g, much more than a typical 15 gm bird or 30 gm mouse," says Parsons. "As such, we expected a low predation rate on the rats -- and our study confirmed this." 

"We are not saying that cats will not predate city rats, only that conditions must be right for it to happen," adds Deutsch. "The cat must be hungry, have no alternative less-risky food source, and usually needs the element of surprise." 

The findings could explain why people continue to release cats as "natural" rat control tools. "People see fewer rats and assume it's because the cats have killed them -- whereas it's actually due to the rats changing their behaviour," says Parsons.

"The results of our study suggest the benefits of releasing cats are far outweighed by the risks to wildlife," he adds. The research team plans to continue collecting data as part of their long-term study and will update their findings as new information becomes available. 

Pussy Cat

"Much more research is needed to better understand the city rat problem, we hope our successes will compel others to perform similar studies in other venues," says Parsons. But for now, in the battle of New York City cats and rats it appears the rats are winning. 

Linking today to Anni's Blog and Viewing Nature With Eileen..