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Leslie is the official rhinoceros mascot of Eth specifically tied to the network's transition to Ethereum 2.0 and its Proof-of-Stake consensus mechanism. Created by the Eth Foundation, Leslie first appeared with Eth staking launchpad around 2021, symbolizing the upgrade's emphasis on sustainability, scalability, and security. The rhino was chosen for its attributes of power, resilience, and determined forward momentum—qualities that mirror Ethereum's methodical evolution from energy-intensive Proof-of-Work to the more efficient PoS system. The name "Leslie" honors Leslie Lamport, a renowned American computer scientist whose groundbreaking work on distributed systems, consensus algorithms (like Paxos), and temporal logic laid foundational principles for modern blockchain technology, including Ethereum's architecture.