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Study: Smelling Sense is Similar in Humans, Insects

Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
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Study: Smelling Sense is Similar in Humans, Insects

Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters

A research team from the Norwegian University of Science and Technology (NTNU) found that the process of "olfactory information" is similar in humans and insects.

By using the brain of a cotton bollworm as a model, the branching patterns and coding mechanisms the researchers detected in the small model brain seem to be relevant not only for insects, but also for mammals—which include people. The findings were published in the journal eLife on October 10.

"We find striking similarities in the structure and function of the olfactory system across different organisms. The similarities are probably related to the fact that the olfactory system is evolutionarily the oldest of all sensory systems," said Xi Chu, a researcher in Chemosensory Laboratory at NTNU and senior author on the study.

The researchers studied second-order olfactory neurons in male cotton bollworms. The males carry signals from the primary olfactory center to other areas of the brain, where the signals are further interpreted to provide the correct responses. They're strangely similar to neurons, called mitral cells, in humans and other mammals.

"When we smell something, it's because certain molecules that are dispersed in the air first activate sensory neurons in the olfactory epithelium. This is an area in the nose that captures odor molecules and carries them further into the brain's primary olfactory center. Here, the sensory terminals form a kind of map, so neurons that have the same type of olfactory receptor accumulate within spherical structures called glomeruli," Chu explained.

"Insects have a similar system of sensory olfactory neurons that form glomeruli in their antennal lobes. The similarity also applies to second-order olfactory neurons that send signals from the primary olfactory center to higher-order areas," he added.

The various odors are represented in the form of a collection of non-overlapping glomeruli in the primary olfactory center. But they are arranged in a quite different way in the subsequent second-order centers. In both insects and humans, the terminals of second-order olfactory neurons cover relatively large areas that partly overlap, he explained.

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NEOM Nature Reserve Reintroduces Six Animal Species

NEOM is working to rebuild self-sustaining ecosystems through habitat rehabilitation, species recovery, and cutting-edge ecological monitoring - SPA
NEOM is working to rebuild self-sustaining ecosystems through habitat rehabilitation, species recovery, and cutting-edge ecological monitoring - SPA
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NEOM Nature Reserve Reintroduces Six Animal Species

NEOM is working to rebuild self-sustaining ecosystems through habitat rehabilitation, species recovery, and cutting-edge ecological monitoring - SPA
NEOM is working to rebuild self-sustaining ecosystems through habitat rehabilitation, species recovery, and cutting-edge ecological monitoring - SPA

As part of its bold rewilding strategy, NEOM has reintroduced more than 1,100 animals across six species to its expansive Nature Reserve—an important milestone in its broader mission to restore the region’s natural balance. With 95% of the region’s land preserved for nature, NEOM is working to rebuild self-sustaining ecosystems through habitat rehabilitation, species recovery, and cutting-edge ecological monitoring.

According to NEOM, when the Arabian Oryx was first reintroduced into the Nature Reserve in December 2022, it marked a milestone occasion, signifying the first time the animal had walked the sands of north-western Saudi Arabia for nearly 100 years, SPA reported.

In the early 1970s, the Oryx was extinct in the wild due to hunting and poaching, but conservation efforts across the region have seen its numbers swell in recent years, with more than 208 now calling NEOM home. Perfectly adapted to the region’s desert conditions, its white coat reflects the sun, while its complex nasal system cools the air it breathes and conserves water by recycling moisture as it exhales.

Another member of the Bovidae family, Arabian Sand Gazelles are petite, graceful animals that typically reside in sand dunes and coastal flats across the Arabian Peninsula. Gazelles are swift creatures, clocking speeds of up to 100 kilometers per hour in short bursts.

They are herbivores, and while NEOM’s regreening initiative continues to develop – with 4.7 million trees, shrubs, and grasses planted to date – the 530 Arabian Sand Gazelles currently residing in the reserve benefit from the natural vegetation that has returned to the area, following the removal of heavy livestock grazing. NEOM is also home to 223 Arabian Gazelles, which are typically darker in color and harder to find, preferring to reside in foothills and rugged mountain terrain.

Desert-dwelling wild goats can be found in NEOM’s rocky, mountainous terrain, and are typically recognized by their impressive arched horns. Males have backward-arched horns that can reach up to one meter in length, while females have much shorter horns and are lighter in color.

They are incredible climbers and have hooves with rubbery soles to act as suction cups on hard surfaces, aiding them in navigating steep cliffs to avoid predators, including wolves. NEOM has successfully reintroduced 53 Nubian Ibex to the reserve, adding to the population of several wild Ibex who have naturally returned to the area and are often caught on camera as part of NEOM’s monitoring program.

The red-necked ostrich, the largest and fastest living bird on earth, can stand up to 2.7 meters tall and weigh more than 150 kilograms. Their eggs are the largest of any living animal, measuring up to 15 centimeters long and up to 1.4 kilograms in weight. The bird gets its namesake from the fact that males have a reddish hue on their neck, especially in breeding season, when they perform an elaborate courtship display to attract females.

Currently, 27 chicks have been raised in NEOM Nature Reserve, which are well adapted to the region’s climate and feed on seeds, grass, leaves, and occasionally small insects or animals. Their strong legs allow them to run up to 70 kilometers per hour and, despite their size, red-necked ostriches are flightless.

Furthermore, the Lanner Falcon, last spotted in the wild in Saudi Arabia more than four decades ago, was reintroduced to NEOM Nature Reserve earlier this year in a momentous occasion. Known for its speed and agility, the Lanner Falcon can dive at speeds of more than 320 kilometers per hour. It has a striking appearance, with dark markings on its chest and belly, and a distinctive black moustache mark across its white face.

The release of Lanner Falcons into Bajdah at NEOM Nature Reserve forms part of a rewilding partnership between NEOM and the Saudi Falcon Club (SFC), which aims to reintroduce native falcon species within the Kingdom.