Spanandry is a term used by biologists and ecologists to refer to species that don't produce very many males.

Some species of arthropods, when diseased, produce 10 females for every 1 male, causing the local population of those insects to exhibit spanandry. Shades of Tiptree's story, Houston, Houston, Do You Read?...

In some insect species, males are very rare even without bacterial infection being present.

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