To answer this question, we need to understand the anatomy of the birds' feet.
Option A) Ostrich - This option is correct because ostriches are flightless birds and they have two toes. This is an adaptation that allows them to run fast on the ground.
Option B) Cardinal - This option is incorrect because cardinals have three toes. Most birds have three toes, with one facing backward and two facing forward.
Option C) Finch - This option is incorrect because finches also have three toes. They belong to the group of perching birds, which have specialized feet for gripping branches and perching.
Option D) Robin - This option is incorrect because robins also have three toes. They have feet adapted for perching as well.
The correct answer is A) Ostrich. Ostriches have only two toes, which is an adaptation for running on the ground.