The Importance of Responses to Stimuli in Other Animals

1.4  The Importance of Responses to Stimuli in Other Animals



Animals have two types of vision, namely stereoscopic vision and monocular vision, in addition to having a different hearing frequency range for each animal.

Differences between stereoscopic and monocular vision:

Stereoscopic vision

Monocular vision

Both eyes are in front of the head

One eye on each side of the head

Both eyes are used to see an object

Only one eye is used to see an object

A smaller field of vision

Wider field of vision

Can estimate the position and distance of an object more accurately

Inaccurate distance and position estimates

Examples: tigers, eagles, and bears

Examples: deer, goats, and cows

 The stereophonic hearing:

  • Hearing uses both sides of the ear

  • Helps determine the direction and location of sound


Hearing frequency range (Hz)


67 - 45,000


200 - 76,000


150 - 150,000


2,000 - 1,110,000

The diversity of sensory organs and animal responses:

Sensory organs



Hedgehog (Hystrix africaeaustralis)

Has sharp and strong feathers on the body and will release thorns towards the enemy as a defense system

Electric field

Electric fish (Gymnarchus niloticus)

The electrical organs in fish produce an electric field that can detect the direction of a nearby object or organism


Beetle (Melolontha melolontha)

Male beetles use antennae to detect pheromones produced by female beetles to find breeding mates

Organ Jacobson

Snake (Vipera Crotalinae)

This organ is located in the palate of the snake's mouth which can detect the odor that has accumulated on the tongue and in turn detect enemies

Lateral line


The lateral lines on the body of the fish can detect changes in water pressure, detect prey, and aid movement