Not 'feelings' exactly, but, 1mm long nematode worms (with only 1000 cells) can show signs of depression and become addicted to nicotine amongst many other surp

Not 'feelings' exactly, but, 1mm long nematode worms (with only 1000 cells) can show signs of depression and become addicted to nicotine amongst many other surprisingly 'human' behaviours. https://en.wikipedia.org/wiki/Caenorhabditis_elegans https://en.wikipedia.org/wiki/Caenorhabditis_elegans https://scholar.google.co.uk/scholar?q=c+elegans+depression&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ved=0ahUKEwi4n9qJ6ojLAhVCWRQKHcLbCaMQgQMIHTAA https://scholar.google.co.uk/scholar?q=c+elegans+depression&...