Re: LBI Broods and Social Sharing

John Waters (
13 Oct 1996 09:41:29 GMT

Paul Crowley <> wrote in article

> So I suggest that SBI (short birth interval) would not be
> unless the mother had a good supply of protein to feed direct
> her infant(s).

JW: This is out of context. In this article, I am talking about
LBI (long birth interval) broods. The age difference of
surviving infants in the LBI multi-age brood must be 4 to 6

I appreciate this definition is purely arbitrary, but it makes
good sense in the context of hominid evolution. In the SBI
(short birth interval) multi-age brood, the age difference of
surviving infants is 1 to 2 years. There is no evidence of a
sustained SBI
multi-age brood characteristic in hominids, prior to the
establishment of sedentary farming and wet nursing, 5 to 10

By contrast, there is evidence of the LBI brood characteristic
in hominids several hundred thousand years B.P. The LBI broods
may have developed over a million years B.P. See Dr Millard€s
letter. The LBI brood led to the hominid speech and language
capability. As this process involves long term genetic mutation
and selection, the inference is that the LBI broods were
established at least 250 Kya.

I shall be posting an article on the SBI broods and Civilisation
in a few weeks, so keep your powder dry. Incidentally, you can
get a preview of events by looking at The Helpless Baby Theory
on the new Origins of Humankind site. This can be accessed at
the following URL.


The riddle of life: What regular sided solid can be divided into
two equal halves, in such a way that each half is exactly the
same shape, and exactly the same size as the original solid?