To create animal tags that are searchable, create a "tag field" in System Settings - Settings - Animals - Additional Information.
For example, you can tag animals by phenotype:
 Additional Information Tab
Go to system settings - Settings - Animals and click on Additional Information Tab.
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 Create New Tag Field
Name a new field with type "Tag."
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 Submit Changes
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When adding animals, you can now add a tag. You may tag as many times as you like; previous tags will appear in a dropdown menu.