Chapter 29, Problem 23A

Summary Introduction

Introduction:

The beakis an external anatomical shape observed commonly in birds, but additionally in non-avian dinosaurs and some mammals. A beak is used for eating and for preening, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young. Although beaks differ significantly in size, shape, color and texture, they share a same underlying shape. 

Answer to Problem 23A

Correct answer:

The correct answer is option (A) broad and flat.

Explanation of Solution

Explanation/justification for the correct answer:

Option (A) is broad and flat.Ducks and geese have long and flat beaks that are used for straining water and dirtfrom aquatic plants. The water filters through small comb like structures lining the edges of the bill. Birds of prey that include owls, eagles, hawks, and falcons, all have very unique adaptations. So, the correct answer is option A.

Explanation for incorrect answer:

Option (B)is large and scooped. Pelicans are characterized with the aid of using long beak and a large throat pouch used for catching prey and draining water from the scooped-up contents before swallowing. So, this is an incorrect answer.

Option (C)is sharp and hooked. Eagles, vultures, kites and hawks have strong, sharp and hooked beaks by which they tear flesh into small pieces.So, this is an incorrect answer.

Option (D) is long, thin, and pointed. The Turdusmigratoriususes its long beak to probe for worms in the soil. Other insect-feeding species with a long, thin beak consist of the brown creeper (Certhiaamericana).So, this is an incorrect answer.