How many digits (fingers and thumb) on their hand do morphs have?
Despite some erroneous images drawn by various artists, most morphs have five digits on their hand, not four. While there are some exceptions, morphs have five digits because they are engineered with human genes which specify the five digits. To create a morph with a different number requires additional, and usually pointless, extra work. Of course some were nevertheless created with four digits only during the period before the Gene Wars, and several survived those wars. Rakshani also have five digits and, allowing for fur and claws, are remarkably like human hands. Caitians, however, possess only four digits which are thicker and shorter than the Rakshani. Incidentally, the Caitian people use a base eight number system directly because of this. While Caitans in general have a strong facility with languages, dealing with the common base ten number system used by other Federation members remains a constant stumbling block.