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This study looked at the differences in cranial morphology of tree squirrel species (F. leucogenys) from four different locations in Rainforest part of Nigeria. The squirrels were captured through the use of locally fabricated live traps made of wire-mesh and steel. Trapped specimens were immediately transferred to the laboratory in captivity cages, where they were euthanized in a bell-jar containing chloroform-soaked cotton wool. Specimens were then preliminarily identified to the generic level, using an identification key. The skull of 131 tree squirrels were prepared using Long Island Natural History Museum guide and the sex of the specimens was determined by visual inspection of the external genitalia. The skull and other body parameters were measured using digital venier caliper. The results showed that the body parameters (HBL, TL, TBL, EL, HFL and BW) measured were slightly different from one location to another. Also, the cranial measure showed some similarities among some locations (Ile-Ife, Emure-Ekiti and Ado-Ekiti), while measurement on squirrels from Sekona was different from other three locations. In conclusion, the cranial measurements of the tree squirrels shows there was no new species of F. leucogeny from the sampled locations.
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