Not to mention the beetle's antennae, which resemble Thunberg's signature pigtail braids. According to London's Natural History Museum, the newly named arthropod "belongs to a group of some of the smallest known free-living animals".
Added her mother, Georgina: "She's actually making a difference by making the world be accountable for itself". It was collected in samples of soil and leaf litter by Dr. William C. Block in the 1960s.
Museum officials suggest that the new Greta beetle is just one of many new species yet to be discovered.
Michael Darby told BBC he chose the name because he was "immensely impressed" with Thunberg's activism.
"I'm really a great fan of Greta", Darby said.
It's formal scientific name is Nelloptodes gretae.
"I am delighted that we have published a species name that acknowledges all that Greta and her supporters have done", said Andrew Wakeham-Dawson, editor of the magazine.More news: Drake, Jones don't travel with Dolphins to Pittsburgh
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Ms Thunberg was nominated for the Nobel Peace Prize in 2019, which was later awarded to Ethiopia's Prime Minister Abiy Ahmed.
She invoked the name of Severn Suzuki, the daughter of David Suzuki, who delivered an impassioned speech at the Rio Earth Summit at the age of 12 in 1992, and who stood by her side on Friday.
The court challenge Thunberg alludes to calls on Ottawa to stop conduct that violates their charter rights and to implement a plan that reduces Canada's greenhouse gas emissions "in a manner consistent with what best available science indicates is needed for the federal government to protect young Canadians, do its fair share to stabilize the climate system, and avert the catastrophic consequences of climate change".
She rose to worldwide prominence after she began school strikes in August 2018 that sparked the global youth-led climate change protest movement Fridays for Future.
She talked about how such actions coupled with the growing climate strike movement she ignited previous year was a hopeful sign, and that its collective message to clean up the planet continues to pressure world leaders to act on the science of climate change.
What began as a lone fight in August a year ago outside the Swedish parliament spread all over the world and involved more than 100,000 schoolchildren in 112 different countries. Her demand for more aggressive action to combat climate change inspired the Fridays For Future movement, which has seen students around the world join in the weekly protests.
Greta has Asperger's and ADHD but has often spoken on how her conditions have acted as a motivator instead of a source of depression, which she said they once were.
Asked why she wanted to attend, Lyra, who held a small "I'm with Greta" sign, replied: "I need to listen to Greta's news".