Screen width of at least 320px is required. Screen width can be adjusted by widening your browser window or adjusting your mobile device settings. If you are on a mobile device, you can also try orienting to landscape.

Practice your pronunciation

Speed 1.0x
/
aa
AA

Pero aún quedan muchísimas preguntas sobre la evolución de las aves que este fósil puede ayudar a resolver.

Continue the conversation

Go further and experience the full content — and understand how Spanish is actually used.

Continue

Already have access? Log in.