Allow 'Count' type custom properties
In addition to custom properties of type Checkbox, DropDownList & Text, add a 'Count' type.
This allows to add individual properties for eg. Male Count, Female Count, Juvenile Count, etc, on a single observation.
The advantage over simply using a Text type property here, is that the counts would be added together automatically when reviewing observations. This is in addition to being presented separately too.
It also means counts would be available to use by population graphs, and be validated to only contain numeric values. This includes the use of + and c characters.
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Edward King commented
Consider adding a checkbox or count field for recording when juveniles of a species are observed. I currently use the notes field for that, but that means the data are not filterable.