Full Idea
Heidegger borrows a common German word 'dasein', meaning 'being' or 'existence', to refer both to 'the manner of Being which... man... possesses', and to the creature which possesses it.
Gist of Idea
The word 'dasein' is used to mean 'the manner of Being which man possesses', and also the human creature
Source
report of Martin Heidegger (Being and Time [1927], p.32) by David E. Cooper - Heidegger Ch.3
Book Reference
Cooper,David E.: 'Heidegger' [Claridge 1996], p.28
A Reaction
This just strikes me as an elementary ontological mistake. Because something has startling properties it doesn't follow that we have a different type of Being. Magnets don't have a different type of being from ordinary iron.