Utheria

Source type
• Primary — data gathered from direct observations by individual(s) that both gathered the data and authored the source paper.
• Secondary — data presented in a source which the author(s) of the source did not personally gather, regardless of whether the source is acknowledged. eg, ‘Gittleman (1993) found that mountain lions are 155g at birth’ or ‘mountain lions have neonates that are 155g’.
• Extrapolated — data that is extrapolated from primary data. For example, body mass is sometimes extrapolated from shoulder heights in ungulates and forearm lengths in bats.



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