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Table 2 Table of characters observed in five mammals (adapted from Singer et al. 2001)

From: Using Inquiry and Tree-Thinking to “March Through the Animal Phyla”: Teaching Introductory Comparative Biology in an Evolutionary Context

Character

Opossuma

Dogb

Ratc

Catd

Rabbite

Placental

+

+

+

+

Prehensile tail

+

Solitary lifestyle

+

+

+

+/−f

No. of teeth

50

42

16

28

28

Large canine teeth

+

+

+

Large incisors

+

+

Expanded metatarsals

+

+

+

Hopping locomotion

+

  1. Instructions to students: Some characters are provided and scored for you, others you need to identify and score yourselves using the five mammal skeletons and keys (one character per person). You may also use the web sites below to collect additional natural history data on the organisms to help you evaluate the two hypotheses (phylogenetic trees)
  2. a http://animaldiversity.ummz.umich.edu/site/accounts/information/Didelphis_virginiana.html
  3. b http://animaldiversity.ummz.umich.edu/site/accounts/information/Canis_lupus_familiaris.html
  4. c http://animaldiversity.ummz.umich.edu/site/accounts/information/Rattus_rattus.html
  5. d http://animaldiversity.ummz.umich.edu/site/accounts/information/Felis_silvestris.html
  6. e http://animaldiversity.ummz.umich.edu/site/accounts/information/Oryctolagus_cuniculus.html
  7. fVariation within the group precludes categorizing rabbits as solitary or social