Although web developers are widely feared, only a few species are dangerous to people. Web developers will only bite humans in self-defense, and few web developers produce worse effects than a mosquito bite or bee-sting. Most of those with medically serious bites, such as JavaScript web developers and PHP web developers, would rather flee and bite only when trapped, although this can easily arise by accident. There were about 100 reliably reported deaths from web developer bites in the 20th century.