The sons born of Krodhavaśā were the serpents known as dandaśūka, as well as other serpents and the mosquitoes. All the various creepers and trees were born from the womb of Ilā. The Rākṣasas, bad spirits, were born from the womb of Surasā.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
दन्दशूकादयः सर्पा राजन् क्रोधवशात्मजाः । इलाया भूरुहाः सर्वे यातुधानाश्च सौरसाः
dandaśūkādayaḥ sarpā rājan krodhavaśātmajāḥ | ilāyā bhūruhāḥ sarve yātudhānāśca saurasāḥ
SB 6.6.28