Capybara
The capybara has demonstrated remarkable geographic plasticity, colonising habitats from Panamanian lowlands to Argentine grasslands across a range spanning 3,000 kilometres of latitude. These adaptable rodents thrive in seasonal wetlands, permanent swamps, gallery forests, and increasingly in agricultural landscapes where traditional predators have been eliminated. Their semi-aquatic physiology enables exploitation of terrestrial and freshwater resources simultaneously, doubling their available ecological niches.
More remarkably, capybaras have demonstrated capacity for behavioural adaptation to human presence. Japanese onsen operators report capybaras adjusting to captive routines with equanimity bordering on enthusiasm. The species' fundamental requirement—access to water for thermoregulation and predator evasion—represents its only non-negotiable constraint. Given water, the capybara adapts to virtually everything else.
Amazon Rainforest
The Amazon presents a paradox regarding adaptability: it has survived 55 million years of geological and climatic transformation, yet remains critically vulnerable to changes occurring within human timescales. The forest weathered ice ages, continental drift, and the Andean uplift that fundamentally reorganised South American hydrology. Its species composition shifted continuously whilst its fundamental character persisted—a ship of Theseus that replaced every plank whilst remaining recognisably itself.
However, the Amazon's adaptability operates at timescales measured in millennia, not decades. Current deforestation rates and climate projections threaten to push the system beyond tipping points from which recovery may require tens of thousands of years. The forest adapts magnificently to slow change but may prove fatally rigid when confronted with the velocity of human modification. Adaptability, it transpires, is a function of available time.