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Most bees are solitary species. Many build their nests in or on the ground, and therefore rely on key habitats being available and undisturbed. Some, like honeybees, are generalists, meaning that they forage on a range of flowers; others are specialists, meaning that they're dependent on particular plant species being present in their environment. Take the sunflower leafeutting bee, which collects pollen from sunflowers and builds nests out of leaves, using its mandibles (like giant teeth attached to the front of its head) to dig down into hard-packed soil and build a tunnel more than four times the length of its body. This bee was once common across the grasslands of north America but, since more than 90 per cent of these habitats have now been converted to agricultural use, it's been driven out of much of its native range. The rusty patched bumble bee, a brightly furred being that often forms its nests in the abandoned burrows of other species, has a similar story: following declines across 87 per cent of its historic habitat range, in North America it is now officially listed as an endangered species.

https://aeon.co/essays/why- keeping-bees-means-thinking-about-landscape-as-a-system

Read the paragraphs and write down the topics and main ideas.