exist in large numbers
abound - abundance
If things ‘abound’ then there are a lot of them. This type of abundance can be good or bad, depending on the particular thing in question. For that reason, it has both positive and negative connotations. Most commonly encountered in written English.
Rumours abound about why Fiona quit the company, but nobody knows the real reason except her.
With misinformation on the crisis abounding, it is very hard for the public to gain a strong understanding of what is actually happening.
Spring is John’s favourite time of year. As a horticulturist, he loves to see gardens start to abound in flowers.