The Families of Pennsylvania Mammals 



The Pennsylvania Mammals represent 16 Fam- 

 ilies which may be determined in the following out- 

 line: 



(1) The Order Marsupialia is represented in the 

 State, in fact in all America by a single family: 

 Opossum: Didelphiidae 



(2) The Order Insectivora is represented by two 

 families: 



1 . Fore feet very large and modified 

 for digging: Moles: Talpidae 



2. Fore feet not modified for digging, 

 Shrews: SORICIDAE 



(3) The Order Chiroptera is also represented by a 

 single family: The Bats: VespertilionidAE 



(4) The Order Carnivora is represented in the State 

 by five families, as follows: 



a Claws not retractile 

 b Tail rudimentary: Bears 1. UrsidaE 



bb Tail well developed and long 

 c Feet digitigrade: hind foot with 4 toes: Foxes 



2. Canidae 



cc Feet plantigrade: hind feet with 5 toes: 

 Raccoons 3. Procyonidae 



aa Claws more or less retractile 



b Hind foot with 5 toes: Weasels and Skunks 



4. MUSTELIDAE 



bb Hind foot with 4 toes: Wildcat 5. FelidaE 



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