page_title: Harrison's rule
hierarchical_section_title: Harrison's rule
caption_attribution_description: English: Schematic representation of Harrison's rule with Poulin's supplement
context_page_description: Harrison's rule is an observation in evolutionary biology by Launcelot Harrison which states that in comparisons across closely related species, host and parasite body sizes tend to covary positively.
context_section_description: Harrison's rule is an observation in evolutionary biology by Launcelot Harrison which states that in comparisons across closely related species, host and parasite body sizes tend to covary positively.
caption: Schematic diagram of Harrison's rule with Poulin's supplement: small host species harbor small, large host species harbor both small and large (on average: larger) parasite species
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