Philanthro
Insofar as there is an organism there is a self-encirclement.
Captivation means that the comprehension of other beings is withheld to the animal.
Even if animals perceive things, there is no language-based reflection on the things, because our language fundamentally is used for the naming of things.
The animal pursues its instincts in being to that for which it is open.
The animal is both limited by its drives, but its drives are also what intent it. They are what gives the animal a line along which they relate forward.
The ring is basically self-preservation and maintenance. The ring is constitued by the drives. One organism is always trying to push the boundaries of its encircling.
Being and Time is about Care (Sorge) and Dying (Sterben). This is the being-towards-death and so on.
Captivation is the motility, which is the essence of the organism.
Having a world also implies an openness to something. The stone lacks that.
Animal is only poor in world in comparison to humanity. It is a contingent thesis.
Heidegger critiques the anthropological position. Thomas Sheehan writes about understanding this part of Heidegger. He is not interested in galaxies beyond how they appear.
Heidegger is throughout a phenomenologist. There has to be something that appears to the phenomenologist. And he is ultimately always grounded to the human beings and its appearances, despite saying that we cannot ground things in the whims of the anthropos. This still means that if anything matters, it matters to us, so there is always an everlasting human element.