Why We Should Build For Wildlife as well as People
Why We Should Build For Wildlife as well as People
BBC - Future Planet - July 27th, 2021
Every time we build something, another patch of ground that could have been a home to wildlife disappears. But Dusty Gedge argues that, in many cases, we can return that patch of ground to nature – up on the roof.
Instead, he describes a plethora of cases that reveal just how biodiverse green roofs can be. He’s witnessed birds flying to high-rise roofs, populations of rare butterflies dancing around flowers, orchids blossoming, and insects scurrying around, including grasshoppers.
Our buildings need not present an unmitigated threat to nature – they could instead accommodate plants and animals. The surface area, particularly of large, inner-city buildings, is significant. What if wildlife could live there, on our roofs and in our walls? It might go some way to redressing the balance.
Gedge says that a habitat area particularly at risk in places such as the UK is dry grassland. This can, however, be adequately simulated on rooftops, he points out. Wildflowers, grasses and sedum attract insects and birds, even several storeys up. Green roofs, also known as living roofs, can be peppered with decaying wood, where insects thrive, and constructed in an undulating topography with nooks and crannies or sandy mounds that suit burrowing species such as solitary bees.
Gedge is also a fan of nest boxes for swifts, birds that migrate from Africa to the UK and other parts of Europe, where they hatch and rear their young in the summer. But because modern housing is so well sealed, without so many nooks and crannies, these birds and others like them often find it harder to make their nests beneath the eaves.
“It’s very, very sad to see the decline of swifts all over the UK and most of it is because people have tidied up their houses and swifts can’t get into them,” says Gedge.
One solution is to fit artificial swift nests or boxes to walls, or bricks with holes in them so that swifts can access nesting areas enclosed in an attic – new builds for birds. Studies have shown that swifts often take to these nesting sites with fervour – including after they are installed on buildings during renovations.
There are many interventions in a similar vein, which welcome wildlife in to the fabric of buildings. Take bee bricks, for instance. They are full of little holes that allow bees to nest in them. And some people install bat boxes, which may be specially designed to support local species.
Sue Young at The Wildlife Trusts says that smaller mitigations such as bird and bat boxes must be supported by nearby landscaping that provides food for insects, birds and other species.
“It’s no good having features just in the built development, putting up a bee brick in every house, if there’s nothing else,” she says. “Wildlife needs homes but it also needs to eat as well.”
Crane says that sometimes people are unaware of just how much wildlife is present in the landscape around us. Outside of work, he occasionally counts fish passing along a river for a local watershed association, which works to improve water quality. Thanks to a box placed in the river through which the fish dart, he is able to clearly see how many travel through in a short time. “You can see 600 fish within 10 minutes,” he says.
And so, whenever we build something, he adds, it’s our responsibility to accommodate wildlife that would be displaced otherwise.
Those with similar views are now working to influence the world of architecture. Wolfgang Weisser at the Technical University of Munich co-runs a consultancy called Studio Animal-Aided Design, which seeks to improve the biodiversity credentials of proposed buildings.
The approach used by the firm, which is still a work in progress, involves engaging the owners, residents or users of a planned building in a discussion about which local species they would like to support in and around the property once it is constructed.
One project that Weisser and his colleagues worked on, now completed, is an apartment complex in Munich. There, the investor behind the building agreed to interventions such as woodpecker and bat boxes, a roof covered in plants and what Weisser calls “hedgehog drawers” – small wooden boxes in which the spiny mammals can rest or hibernate. The drawers slide out of the exterior wall for occasional maintenance.
“The basic idea is to make the animal a stakeholder in the building process,” explains Weisser.
Studio Animal-Aided Design is now working on more building plans with additional interventions for wild species, which could help them thrive alongside humans.
Among the benefits of this could be more balanced ecosystems. Crane points out that having bats nest in your house or apartment building can be quite beneficial for people – because a whole colony of bats can do a good job of keeping mosquitos at bay on summer evenings.
“If people know how important it is to help nature, and how important nature is to us, we generally find that people are very keen to do something to be able to help,” says The Wildlife Trusts’ Sue Young.
Justin Bere, an architect and founder of bere:architects, has long considered the value of residing close to nature, even in the heart of a city. He lives in a house he designed in London. The exterior and roofs are decked out with plants, wildflowers and trees.
The garden even includes a small hazel coppice where Bere has often watched birds nesting. There, in the middle of what could be called a green island, he says the chicks are safe from local cats and magpies that might otherwise prey on them in more exposed places.
Reflecting on the experience of watching wildlife through his window he says, “You realise how much complexity there is in nature.”
By making our buildings just a little more accommodating to this complexity, we could reap ecological rewards as well as personal ones. It will take more than carpeting roofs and walls with plants to stop the biodiversity crisis – but it could be a stimulating start.