In 1980, the monarch butterfly population reached about 4.5 million. Last year, the number fell to a staggering 28,429 — a 99.4 percent decline.
Source: “Below 1%”: Monarch Butterfly Approaching Total & Irreversible Extinction
In 1980, the monarch butterfly population reached about 4.5 million. Last year, the number fell to a staggering 28,429 — a 99.4 percent decline.
Source: “Below 1%”: Monarch Butterfly Approaching Total & Irreversible Extinction