Birding has few requirements for those looking to get involved. You only need keen eyes, binoculars, a bird guide and “a positive attitude,” according to the National Park Service (NPS).

During mating rituals, male birds show off their feet to prospective ... They may fly far out to sea while keeping a keen eye out for schools of small fish, such as anchovies.

However, vomiting also enables these birds to quickly lighten their body weight, so they can take flight and escape more easily. These scavengers find food using their sight and keen sense of smell.

Keep your eyes and ears open for red-winged ... making circles. They use their keen sense of smell - among the best for birds - to find fresh carcasses, which is often roadkill.

A peregrine falcon with dark stripes under its eyes that protect ... birds called raptors (or birds of prey), which are distinguished mainly by their hooked beaks, keen eyesight and sharp talons.