Not sure where you live but I'm in Australia. In Europe or North America, I hear virtually no birds. In Australia and including in my suburban backyard, there a

Not sure where you live but I'm in Australia. In Europe or North America, I hear virtually no birds. In Australia and including in my suburban backyard, there are loads of birds - songbirds, parrots/lorikeets/cockatoos, magpies. I have an acacia (with parasitic growths that birds visit for berries) and loads of fruit trees among other things that attract birds. We have no shortage of birds. But this is Australia and there are many spiders - trees, ground, adapted to the urban environment, etc. Huntsmen, red backs, black house spiders, white-tailed, orb weavers, wolf spiders, mouse spiders, etc. Every alcove or cavity or pipe has a spider. Go out with a headlamp at night, and the eyes of wolf spiders reflect back at you from everywhere. Spiders live in all the rear-view mirrors of my cars, and under the rear wiper blades. Multiple spiders live in the frame of each window and sliding door, at all times. From my travels, I'm convinced we have a far more noticeable urban spider population than say Europe or the US. The urban environment here is flooded with spiders. Corrugated iron is perfect for them, creating a cavity every inch or two the length of a building. Multiple spiders live on every chair of my outdoor setting. Not much of the back verandah does not have continually refreshed spider detritus hanging underneath eaves. If I turn a spadeful in the garden when it's dry, multiple wolf spiders emerge and try to resettle. Admittedly our gifted spider hotel is small (size of a box of cereal), but it only takes one spider to crawl a scrappy web across it, and it's not going to be of much use to insects. In my 40+ years, I've found one wasp nest with entombed spiders (mostly large orb weavers). But you can't move around here without encountering a spider. Maybe an insect hotel stands a better chance elsewhere in the world, but here it is trivial for every cavity to be controlled even by one spider, and I'm pretty confident spiders are not in desperate need of more housing opportunities.