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It is possible to make a few generalizations about the six giants themselves.

There seems to be a rough correlation between the initial and ultimate lengths, starting with the smallest ( boa constrictor ) and ending with the largest ( anaconda ).

Data on the former are scanty, but there can be little doubt that the latter is sometimes born at a length greater than that of any of the others, thereby lending support to the belief that the anaconda does, indeed, attain the greatest length.

For four of the six ( the anaconda and the amethystine python cannot be included for lack of data ) there is also a correlation between size at maturity and maximum length, the boa constrictor being the smallest and the Indian python the next in size at the former stage.