Birdle starts with a photograph of a single bird and allows six guesses to name its species. Each attempt is checked level by level against the answer's order, family and genus, so a wrong bird from the right family still narrows things down. You can choose the region the birds come from, from the whole world to the Lower 48 states, Europe, Africa, Asia or Australia and its territories, and photos are credited to their photographers through eBird. Over time, the wrong guesses teach you the bird family tree.
The list begins with bird-specific games: a UK photo quiz, a North American game that adds birdsong and a banding-code puzzle. Then come games that use taxonomy the way Birdle does, family trees of animals and plants, and finally photo-based guessers for fish, sea mammals, dogs and even droppings.
Also begins with a bird picture, restricted to UK species, but the feedback is about spelling: letters turn green or red depending on whether the name contains them, and a hangman-like reveal builds up as you go.
Works on North American species using close-up pieces of a photo plus brief recordings of the bird's song, so it adds listening to Birdle's looking, and an extensive archive of earlier birds awaits.
A puzzle for birders who know the shorthand: the target is a four-letter banding code, the way MODO stands for mourning dove, cracked in six tries with colored letter tiles in place of taxonomy.
Takes Birdle's order, family and genus feedback to the whole animal kingdom: each guess is placed on a growing tree of relationships to the hidden species, and you get 20 attempts to reach it exactly.
Bundles eight animal puzzles, the main one a hidden species worked out from taxonomy and habitat as in Birdle, plus side rounds with blurred pixel photos, continent maps, Venn diagrams and connection groups.
Six tries at an aquatic mammal, anything from otters to whales, where a yellow mark tells you the guess shares the answer's family, the same nudge Birdle gives, and further clues cover appearance, range and conservation status.
Moves the family-tree idea from birds to botany: every plant you name is placed on a chart of shared ancestry with the hidden one, and you have 25 attempts to pin down the exact species.
Another photo-to-name game, this time for dog breeds: a player-submitted dog appears and you have five attempts to name its breed, with separate puzzles for single breeds and mixes.
Photo identification with a twist: the picture is a close-up of droppings, and over six guesses you compare traits with the animal that left them, while arrows say whether it is heavier or lighter.
Yes. A region menu lets you play with birds from the whole world or narrow it to the USA's Lower 48 states, North America, Central America, South America, Europe, Africa, Asia, or Australia and its territories, which helps if you know your local species far better than the rest of the world's.
After each guess, Birdle compares your bird with the answer at three levels of classification, order, family and genus, before the common name itself. A guess in the right family but the wrong genus tells you the answer is close, so even a miss sharpens your next pick. Six guesses are allowed in all.
Birdie Game works on North American birds, combining small sections of a photo with brief recordings of each bird's call, and keeps plenty of earlier birds to replay. For a different bird challenge, BRDL asks for the short code birders use when banding, like MODO for mourning dove.
