Cambridge 20 · Academic Reading Test 1

The kakapo is a nocturnal, flightless parrot that is critically endangered and one of New Zealand ‘s unique treasures. The kakapo, also known as the owl parrot, is a large, forest-dwelling bird, with a pale owl-like face. Up to 64 cm in length, it has predominantly yellow-green feathers, forward-facing eyes, a large grey beak, large blue feet, and relatively short wings and tail. It is the world’s only flightless parrot, and is also possibly one of the world’s longest-living birds, with a reported lifespan of up to 100 years. Kakapo are solitary birds and tend to occupy the same home range for many years. They forage on the ground and climb high into trees. They often leap from trees and flap their wings, but at best manage a controlled descent to the ground. They are entirely vegetarian, with their diet including the leaves, roots and bark of trees as well as bulbs, and fern fronds. Kakapo breed in summer and autumn, but only in years when food is plentiful. Males play no part in incubation or chick-rearing – females alone incubate eggs and feed the chicks. The 1-4 eggs are laid in soil, which is repeatedly turned over before and during incubation. The female kakapo has to spend long periods away from the nest searching for food, which leaves the unattended eggs and chicks particularly vulnerable to predators. Before humans arrived, kakapo were common throughout New Zealand’s forests. However, this all changed with the arrival of the first Polynesian settlers about 700 years ago. For the early settlers, the flightless kakapo was easy prey. They ate its meat and used…

Mark Rowe investigates attempts to reintroduce elms to Britain A. Around 25 million elms, accounting for 90% of all elm trees in the UK, died during the 1960s and ’70s of Dutch elm disease. In the aftermath, the elm, once so dominant in the British landscape, was largely forgotten. However, there’s now hope the elm may be reintroduced to the countryside of central and southern England. Any reintroduction will start from a very low base. ‘The impact of the disease is difficult to picture if you hadn’t seen what was there before,’ says Matt Elliot of the Woodland Trust. ‘You look at old photographs from the 1960s and it’s only then that you realise the impact [elms had]. They were significant, large trees then they were gone.’ B. The disease is caused by a fungus that blocks the elms’ vascular (water, nutrient and food transport) system, causing branches to wilt and die. A first epidemic, which occurred in the 1920s, gradually died down, but in the ’70s a second epidemic was triggered by shipments of elm from Canada. The wood came in the form of logs destined for boat building and its intact bark was perfect for the elm bark beetles that spread the deadly fungus. This time, the beetles carried a much more virulent strain that destroyed the vast majority of British elms. C. Today, elms still exist in the southern English countryside but mostly only in low hedgerows between fields. ‘We have millions of small elms in hedgerows but they get targeted by the beetle as soon as they reach a certain size,’ says Karen Russell, co-author of the report Where we are with elm. Once the…

Some of the most important decisions of our lives occur while we’re feeling stressed and anxious. From medical decisions to financial and professional ones, we are all sometimes required to weigh up information under stressful conditions. But do we become better or worse at processing and using information under such circumstances? My colleague and I, both neuroscientists, wanted to investigate how the mind operates under stress, so we visited some local fire stations. Firefighters’ workdays vary quite a bit. Some are pretty relaxed, they’ll spend their time washing the truck, cleaning equipment, cooking meals and reading. Other days can be hectic, with numerous life-threatening incidents to attend to, they’ll enter burning homes to rescue trapped residents, and assist with medical emergencies. These ups and downs presented the perfect setting for an experiment on how people’s ability to use information changes when they feel under pressure. We found that perceived threat acted as a trigger for a stress reaction that made the task of processing information easier for the firefighters – but only as long as it conveyed bad news. This is how we arrived at these results. We asked the firefighters to estimate their likelihood of experiencing 40 different adverse events in their life, such as being involved in an accident or becoming a victim of card fraud. We then gave them either good news (that their likelihood of experiencing these events was lower than they’d thought) or bad news (that it was higher) and asked them to provide new estimates. People are normally quite…