You will be frequently hearing loud chip chip chip sound where the squirrels hop around . That’s one of the sound the squirrels make. That’s there way of danger call to their fellows .

Every living being communicates to their partner or other mates through various means like sound signals . That’s their language . It is unique for every species. They communicate love , affection , care , danger signs , happiness and lot more from the sounds they make. We humans are most evolved in language . We communicate , express better than any other species. But the wonders of nature are beyond our thinking. Nature has given wonderful sounds to each species, we often don’t listen in our daily life . The elephant care takers ‘Mahut’ communicate with the elephant in different language, they listen to their care takers , but the same words used by strangers will not be entertained by the elephant. The sounds come out of our body are not just mere noices , they are filled with emotions, that’s the voice of our soul. We just don’t speak,we express the emotions

It’s same for every other species. Most common loud sound we hear of squirrels will be chip-chip-chip ,which they make for quite long time ,may be for some 1-2 minutes. That’s the noise they make while they sence the danger. They will usually make this sound hiding between the branches or in a safe place . They stay still and don’t move while they make . They also make sounds like chirp -chirp ,tsee -tsee ,and many more for different reasons. Below is some of the audio reference.