A slow heart rate is called bradycardia. Some irregular heartbeats are normal: 1  Sinus arrhythmia is the normal variation in heart rate that accompanies breathing in and out.  Sinus tachycardia is the normal increase in the heart rate that occurs in healthy people when they are excited, exercising, or have a fever.
There are four tabby patterns that have been shown to be genetically distinct: Mackerel, Classic, spotted, and ticked. A fifth includes tabby as part of another basic color pattern. The patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively).All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds.A modified Classic tabby is found in the Sokoke breed.he patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively). All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds. A modified Classic tabby is found in the Sokoke breed.
Calico cat coloring from a top view. A young caliby, or calico tabby. Calico cats are domestic cats with a spotted or particolored coat that is predominantly white, with patches of two other colors (often, the two other colors are orange tabby and black).Outside of North America, the pattern is more usually called tortoiseshell-and-white.n genetic terms, calico cats are tortoiseshells in every way, except that in addition they express a white spotting gene. There is however one anomaly: as a rule of thumb the larger the areas of white, the fewer and larger the patches of ginger and dark-or-tabby coat.