Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani children trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani children trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani children trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows a farmer displaying a locust in Okara district in eastern Pakistan's Punjab province. (Str/Xinhua)