Secrets:  Rising sea levels, habitat loss and mass extinction are all quite depressing, but it's not all doom and gloom - Noah, for instance, would have a much easier job building a new Ark. No 300 cubit behemoth needed this time - a pallet and two oil drums will be enough to hold the remaining wildlife! What animals will be left? Well, according to my garden, rabbits, cats, and slugs seem to be bucking the trend. The names around the lid are creatures that we have lost during the sixth mass extinction. Martha is the last Passenger Pigeon, once a widespread breed and now extinct, who lived at Cincinnati Zoo until she died in the 1920s.