Here's why:

* Vesicular texture is characterized by numerous cavities (vesicles) within the rock. These cavities are formed by gas bubbles trapped within the cooling magma or lava.

* Extrusive igneous rocks are formed when magma erupts onto the Earth's surface as lava and cools relatively quickly. This rapid cooling traps the gas bubbles, leading to the vesicular texture.

Examples of extrusive igneous features where you would find vesicular rocks:

* Lava flows: The most common location. As lava flows cool, the gas bubbles become trapped, forming vesicles.

* Volcanic bombs: These are large chunks of lava ejected from volcanoes, which cool rapidly and can exhibit a vesicular texture.

* Scoria cones: These cones are formed from the accumulation of vesicular volcanic rock (scoria) ejected from volcanoes.

Note: Vesicular rocks are not typically found in intrusive igneous features (formed from magma cooling underground) because the slower cooling process allows the gas bubbles to escape before the rock solidifies.