"And why should the palm kernel be neighbours with its relative but has a high and hard wall of boundary? Why?"
Definitely not because it is afraid that the ikwu na ibe aki will come and steal its nut. The wall of protection is against pests that might devour the nut and deny it the opportunity to increase and multiply. Until God created man on the last day and had tp take a rest because man is a piece of work, the others involved just saying the word. Before you know it, he has gone beyond stone tools to invent the hammer and then the crushing machine to squeeze the last drop of oil from every nut. But man the gardener of agaerikocha also plants plantations of palm trees to harvest more palm nuts and tap more sweet palmy, and gather more nuts than he can consume with ukwa, so much of it has to be fr4yed to extract elu aki pomade. Let the kite perch and let the eagle perch, ikwu na ibe, ibe being neighbors of ikwu, not necessarily kin, because neighbors are also children of our mothers.