45 years.

The echidna's brain is half neocortex, compared to 80% of a human brain. Contrary to previous research, the echidna does enter REM sleep, but only in a comfortable temperature around 25 °C (77 °F). At lower or higher temperatures of 15 °C (59 °F) and 28 °C (82 °F), REM sleep is suppressed.

Reproduction

The female lays a single soft-shelled, leathery egg 22 days after mating, and deposits

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