El mundo está repleto de señales que no percibimos. Las criaturas diminutas viven en un mundo diferente de fuerzas poco familiares. Muchos animales “de nuestra escala exceden en mucho el alcance de nuestra percepción de sensaciones familiares. Los murciélagos esquivan los obstáculos haciendo rebotar en ellos ondas sonoras de frecuencia que yo no alcanzo a oír, aunque algunas personas sí pueden hacerlo. Muchos insectos ven el ultravioleta y siguen las invisibles «guías» del néctar de las flores hasta lo que para ellos es una fuente de alimentos y de polen que acarrearán hasta la siguiente flor para su fecundación (las flores crean estas trazas orientadoras de color en su propio beneficio, no en el de los insectos).
¡Qué seres tan poco perceptivos somos! Rodeados de tantas cosas fascinantes y reales que no vemos (oímos, olemos, tocamos, saboreamos) en la naturaleza, y, no obstante, tan crédulos y predispuestos a la aceptación de nuevos poderes que confundimos los trucos de magos mediocres con percepciones de un mundo psíquico más allá del nuestro. Lo paranormal puede ser una fantasía; desde luego es un refugio para muchos charlatanes. Pero los poderes de percepción «parahumana» están a nuestro alrededor en las aves, las abejas y las bacterias.

The world is full of signals that we don't perceive. Tiny creatures live in a different world of unfamiliar forces. Many animals of our scale greatly exceed our range of perception for sensations familiar to us. […] What an imperceptive lot we are. Surrounded by so much, so fascinating and so real, that we do not see (hear, smell, touch, taste) in nature, yet so gullible and so seduced by claims for novel power that we mistake the tricks of mediocre magicians for glimpses of a psychic world beyond our ken. The paranormal may be a fantasy; it is certainly a haven for charlatans. But “parahuman” powers of perception lie all about us in birds, bees, and bacteria.

I suppose they can detect sound vibrations - most marine creatures can - though this atmosphere may be too thin to carry my voice very far... Hello, can you hear me? My name is Frank Pool... ahem... I come in peace for all mankind. Makes me feel rather stupid, but can you suggest anything better? And it will be good for the record... Nobody's taking the slightest notice. Big ones and little ones, they're all creeping towards their igloos. Wonder what they actually do when they get there p. 29

All life has a kind of seamlessness. All creatures have to be aware of their environment, and there has been an evolution of the capacities needed for detecting increasingly complex stimuli. I have no problem calling this "meaning," since all creatures pick out meaningful facets of their environment. For the first creatures, these facets were physical and mediated by receptor proteins. Sperm and eggs find each other by protein shapes; photosynthetic bacteria find light by protein shapes. The impetus to figure out what's going on is still very much programmed into our highly complex brains.

[T]he essence of the belief that bats have experience is that there is something that it is like to be a bat. Now we know that most bats (the microchiroptera, to be precise) perceive the external world primarily by sonar, or echolocation. … But bat sonar, though clearly a form of perception, is not similar in its operation to any sense that we possess, and there is no reason to suppose that it is subjectively like anything we can experience or imagine. This appears to create difficulties for the notion of what it is like to be a bat.

I found out later that these clicks are actually used for communication. These animals also use them to see in the deep ocean. ...It's a form of called echolocation.

In the fish world many things are told by sound waves.

The evolutionary routes are many, she knew, wending through the howling wilderness of the maladaptive, on to their severely narrowed destinations. Biology abounded with convergent examples, destinations arrived at along very different paths. Fruiting bodies of slime molds and myxobacteria alike evolved multicelled advances. Warmbloodedness came forth several times, as did live birth and even penile tumescence. The eyes did indeed have it—as seen in the camera-like eyes of vertebrates and octopi, and the similar tiny preceptors of worms and jellyfish. Nature invented over and over again the mechanisms used by diverse organisms to hear, smell, echolocate, sense the prickle of electric and magnetic fields.

Bats … present a range of activity and a sensory apparatus so different from ours that the problem I want to pose is exceptionally vivid (though it certainly could be raised with other species). Even without the benefit of philosophical reflection, anyone who has spent some time in an enclosed space with an excited bat knows what it is to encounter a fundamentally alien form of life.

An eye from another world; a smell-detector, investigating the path ahead. We don't often see a snail that way, and that's because we've only recently had the tiny lenses and electronic cameras that we need to explore this miniature world. But when we meet its inhabitants face to face, we suddenly realise that their behaviour can be just as meaningful to us as the behaviour of many animals more our own size.

We are an animal that has acquired the ability to perceive that it is an animal.

As to the actual intensity of pain felt by animals, let us take each of the five senses. When compared to humans, most of these senses are far more acutely and highly developed in animals. Additionally, animals possess other remarkable senses, such as the homing instinct and an awareness of their approaching death.

breakthroughs in the evolution of human consciousness will be the recognition of the subtle complexity and the hidden inner world that animals carry around with them. The innocence and silence of the animal world has a huge subtlety to it that is anything but dumb, but rather notices everything and is present in everything. Animals carry a huge ministry of witness to the silence of time and to the depth of nature. They are like the landscape in a sense: they live too in the mode of silence.

The sense impressions of one-celled animals are not edited for the brain: ‘This is philosophically interesting in a rather mournful way, since it means that only the simplest animals perceive the universe as it is (21).