First, I want to clarify my thoughts: I’m not sure if this is a feature idea or a general topic for discussion.
Second, English is not my native language, so some mistakes may occur; however, I can understand written English very well.
Third, I used Gemini to help me fix my grammar and organize this post.
Thank you 
Differentiate Recent vs. Historic observations on taxon maps using color-coding
Idea:
Current Goal: When viewing a taxon map, all observations are displayed as a single color (or a heatmap). It is currently difficult to tell at a glance if a species is still present in an area or if the data points represent historical records from many years ago.
Proposed Solution: I suggest implementing a color-coding system for map tiles/pins based on the age of the observation.
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Example: Use a bright red(current one)
for “Recent” observations (e.g., within the last 20 years) and a darker or different shade for “Historic” observations (e.g., older than 20 years).
Why it will improve iNaturalist:
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Visualizing Trends: It allows users to immediately see if a species’ range is expanding or contracting without having to click on individual pins to check dates.
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Motivating “Rediscovery”: If a user sees “Historic” markers in their local area with no recent sightings, it encourages them to visit those specific spots to see if the species still persists there.
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Data Clarity: It provides a much clearer “story” of a species’ presence in a region over time, which is invaluable for both casual observers and researchers.
Specific examples/locations where this would apply: This would be beneficial globally for all taxa. In the attached mockup, you can see how much more informative a map becomes when you can distinguish between where a species was found 50 years ago versus where it has been seen recently.
Included are two example photos showing a species’ decline in specific areas over time.
Note on Source: This concept is inspired by the map display used on the Flora of Israel Online website, which effectively uses this color-coding to show species distribution over time.
Thank you for time reading this 