Help in identifying for this spear

[Belgian1]

I'm coming back to you because I'm busy reading about the harpoons used for hippo hunting among West African Bozo (Niger, Mali) who say the harpoons have been heavily poisoned with the mix ' tantye. "strophantus sarmentosus" crushed with baga fruit, mixed and dried in the sun and cooked to obtain a thick paste that will cover the tip of the harpoon.

It is also written that "among the Bozo at least", only a few hunters were initiated to hunt hippos.
These hunters knew all the habits and the least reactions of the animal before and during the hunt. Even his habits in groups and his behavior after feeding himself to consider the deadly attack ...

(Journal of the Society of Africanists, 1957, Volume 27, Number 1.)
This "ritual" of hunting bozo hippo is of great interest.
https://www.persee.fr/doc/jafr_0037-...1_T1_0043_0000