Pumpkin is a five-month-old capybara who lives on a wildlife refuge.
Life on earth comes mainly in two sizes – tiny or huge, scientists said.
"Unsustainable practices threaten the future of these animals."
The average adult believes there are 13,128 vulnerable species in the wild - when there are in fact more than 40,000.
The findings are based on almost 50 years of data from 1970 to 2019.
Both animals have been successfully returned to their owners.
At their first health check, the joeys are microchipped, sexed, named and photographed.
Emperor penguins were found to be the most vulnerable.
It was a "Mission Impossible" style move.
Asian elephants are endangered and live in highly fragmented landscapes.