Stories of Good

Darwin’s Rhea and the Biodiversity of Argentina

Written by GGC | Sep 20 2024

Argentina is one of the most biodiverse countries in the world and is home to a rich range of ecosystems. This biodiversity makes it the perfect home for thousands of plant and animal species, many of which are found nowhere else on Earth. Preserving this natural heritage is crucial for not only the environment but also for the cultural and economic well-being of local communities.

Among Argentina’s incredible wildlife is a bird named after Charles Darwin – Darwin's Rhea, also known as the Lesser Rhea. This large, flightless bird is not just an example of the country’s unique wildlife but also of the fascinating stories that emerge from the study of biodiversity. Interestingly, Darwin never saw this bird alive, but it played an important role in the scientist’s contributions to natural history.

 

Darwin’s Discovery

In early 1834, Charles Darwin and his shipmates landed along the coast of Argentina. He hoped to discover the South American version of the Ostrich, a bird notoriously difficult to capture. Among the two Rheas, the Larger and the Lesser, Darwin was interested in the Lesser Rhea. Due to the bird’s speed, however, Darwin and his team found it difficult to capture.

On January 3, 1834, after a long day of searching for the Lesser Rhea, Darwin ran into his crewmate Conrad Martens, who had been out hunting game that day. Martens offered Darwin the choice to study the specimen he had caught or eat it for dinner. After a quick examination, Darwin suggested they eat it. As Darwin and his crew sat down around the campfire to eat, he looked down at his plate and made an unfortunate discovery. He realized the bird on their plate was the very one he had been searching for. Franticly, Darwin collected every remaining part of the bird he could find and shipped them to a taxidermist in London for reconstruction.

Upon his return, Darwin presented the reconstituted bird at a special ceremony of the Zoological Society of London, where it was suggested that the species be named in his honor. According to the Natural History Museum in London, the taxidermized rhea has since disappeared, with hopes it will one day be rediscovered for display.

7 Lesser Rhea Facts

  1. Speed Demon: The Lesser Rhea can reach speeds of 37 miles per hour.
  2. Aquatic Abilities: This bird is an excellent swimmer, often crossing rivers with ease.
  3. Predator Evasion: To evade predators, the Lesser Rhea retraces its steps, squats into bushes to become nearly invisible, and runs in zigzag patterns or makes sharp turns.
  4. Quiet Nature: Though generally quiet, the Lesser Rhea’s chicks whistle, and males emit a loud booming call.
  5. Herbivorous Diet: Their diet primarily consists of saltbush, fruits from cacti, and grasses.
  6. Cultural Significance: In Argentina, it’s known as ñandú petiso or ñandú del norte, derived from Guaraní, meaning "big spider," likely due to their wing movements while running.
  7. Mythological Name: The scientific name Rhea pennata combines Rhea, a Greek goddess, and pennata, meaning "winged."

Economic and Ecological Significance

Darwin’s Rhea plays a beneficial role in agriculture by wandering among cattle and removing burr-like seeds from sheep’s wool. This natural grooming service helps maintain the health of livestock, reducing the need for human intervention and supporting local farming communities.

However, the ecological balance provided by the Lesser Rhea is under threat. Historically, these birds were hunted extensively for their feathers, meat, eggs, and other body parts, which were used in traditional medicine or sold for commercial purposes. Overhunting, predation, nest destruction, and egg collection for human consumption have all contributed to the species’ decline.

Conservation Efforts

Recognizing the critical role Darwin’s Rhea plays in both the ecosystem and local economies, extensive conservation efforts are underway to protect this species. Because Argentina is so rich in biodiversity, threats of deforestation, droughts, and flooding further endanger this delicate ecosystem.

In response, Greater Good Charities has partnered with the Wildlife Conservation Society to safeguard over 150,000 acres of land in the Province of Mendoza. These efforts are crucial for the preservation of many native species including the Lesser Rhea, the Andean Condor, and others. By protecting these lands, we ensure that Darwin’s Rhea continues to thrive and contribute to the ecological and economic health of the region.

How You Can Help

You can join the mission to protect important species and their habitats by supporting conservation initiatives.  By donating today, you can help us monitor and preserve critical land areas in Argentina, ensuring that species like the Lesser Rhea always have a safe and sustainable home. A donation of just $20 can protect two acres of land, making a significant impact in the fight against biodiversity loss.

Together, we can make a difference in preserving the habitat of species like Darwin’s Rhea and safeguarding the natural heritage of Argentina for future generations.