eBird Explore: Find the Bird, Then Read Your Odds

eBird's Explore tab answers a question the checklist screen never touches: is the bird I want actually out there, and how likely am I to see it the week I go? Same free Cornell Lab account, completely different job.

Most people stop at the map of nearby hotspots. Underneath it, eBird will hand you a number.

Start from the sentence in your head

Explore is six tools behind one tab, which is why it reads as a wall of menus. Match the sentence you are actually thinking:

Some Explore functions require you to be signed in, and the smallest geopolitical area eBird summarises is a county or district, never a town. If you need something tighter, work in hotspots.

The bar chart is a probability chart with the numbers switched off

A bar is not a vibe. It is a frequency — the proportion of complete checklists from that region and date range that reported the species — and Cornell publishes the bin each height stands for.

Cornell's own worked example: a frequency of 0.4 means the species was reported on 40% of complete eBird checklists from that area, that week of the year. The vertical line down the chart marks today's date, so the bar it touches is the one that applies to your Saturday. Want the decimals rather than the picture? Download Histogram Data sits at the bottom of every chart.

What that number is, and what it is not

What frequency tells you:

• How often birders there reported the species that week.
• Whether a bird is a fair expectation or a genuine chase.
• When your odds peak — the row's shape beats any single bar.

What it does not tell you:

• How many birds. A tall bar can be one reliable individual at one feeder.
• Where inside the region. A county figure says nothing about which trail.
• What time of day — for owls and rails, the entire question.
• Anything from incomplete lists. The chart uses complete checklists only, so reporting every species you could identify is what keeps it honest — our guide to logging a checklist covers the button that decides it.

Targets: your missing birds, ranked by how easy they are

Targets and Alerts both sit under Explore on eBird.org, in the Species You Need section. Targets is the one to open before a trip.

1. Enter the region — county, state, province or country.
2. Set the range of months you will be there.
3. Pick which of your own lists to compare against: life, year, county, even one day's.
4. Sort by frequency instead of taxonomic order.

Step four is the whole trick. Sorted by frequency the page becomes a ranking: the species on top are the ones most checklists report, so they are the additions you are likeliest to get. Cornell demonstrates it with a December trip to Colombia; it behaves identically in the next county over.

Already have the bird but never photographed it? The blue gear icon at top right switches to Photo and Audio Targets — same ranking, for species missing from your media list.

Community Targets: what your county is overdue for

This one is buried, and it is the closest thing eBird has to an arrivals board. It sits in the eBirding This Month block on any regional Explore page, and the rules are specific:

• Species not yet reported in the region this month.
• But which have been seen around today's date in previous years.
• Reported in multiple years, including at least once in the past two.
• Sorted by how frequently they appear on checklists from the current week in previous years.

Once somebody reports one it moves to the New Species list and a fresh target replaces it — a flagged rarity clears a volunteer reviewer first. In late August that list is effectively your county's early-migrant board.

Alerts answer "right now", and only for seven days

Three kinds, all described here:

• Rare Bird Alerts — anything flagged rare for that place and that date in the past seven days. A bird can be routine one state away and still trigger one.
• ABA Rarities — Code 3, 4 and 5 birds across the US and Canada. National rarities only; a regional oddity never appears.
• Needs Alerts — species you have never reported in that region. Region-specific, so a California alert cannot cover the whole country.

Two limits before you lean on them: a Rare Bird Alert holds at most 500 records from those seven days, so a busy region quietly drops the oldest, and country-wide Needs Alerts are unavailable for the US, Canada, Mexico and Australia — submission volume is too high. Subscribe state by state instead.

Where eBird stops

eBird maps birders at least as much as it maps birds. A hotspot's list is built from what people chose to report there, so a well-watched suburban park will out-list the better marsh nobody visits, and a thin chart in an under-birded county is an open question, not an answer. eBird's own trip-planning guide makes the point from the other side: before eBird, a silent listserv could mean nobody looked or nobody found anything, and you could not tell which.

Treat the numbers as a hypothesis. Pair them with tonight's migration forecast, and keep a field guide beside the phone for the part no database does — explaining why an identification is right. Ours start with the photo-based Kaufman Field Guide (on Amazon).

One county, one week

1. Explore your county, open Bar Charts, and read the bar the date line sits on.
2. If it is tall enough to be worth the drive, switch to Hotspots and find places that reported the bird recently.
3. Check Community Targets for anything the county is overdue for while you are out anyway.
4. Glance at the Rare Bird Alert that morning, then re-read the bar you are betting on.

You are not learning a second app. You are reading the same database from the other end.