INTRODUCTION
The present dataset relating to neonatal weight (for a litter size of one) contains two files. The first file provides numerical data in tabular form. The Table has 170 rows (species) and 7 columns. Observe that half (85) of  the numerical records are drawn from the work of J.F. Eisenberg (see following reference file).
The second file provides 7 references from which all the numerical data in the first file were taken.