Each species of butterfly lays it's eggs on a specific species of plant that their larvae can feed on as caterpillars until they morph into butterflies.
At every stage of this 2-3 week process, they are vulnerable to ants, spiders, mantises, and birds. In nature you'd get one mature butterfly out of every hundred eggs laid.
We grow many of the host species for various species of butterflies in our gardens to increase the likelihood of them locating the specific plant they need when the time comes.
By checking the plants every few days, we're often able to take the eggs into "protective custody" we increase the chances of reaching maturity and flying off to perpetuate their species as much as 95-100%.
If some of them deposit some eggs before moving on it accounts for about 1/10 of what they'll lay, but as I said, that 10% will yield nearly 100% of success.
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