English: Lamarckian inheritance is the idea that individuals can pass down traits acquired during their lifetime to their offspring. This diagram is an example that supports Lamarckian inheritance. The first giraffe has a short neck and cannot reach the leaves to eat. Over time the first giraffe would create a gene that would say it needed a longer neck to reach the food and it would then pass down the trait to its offspring to have a longer neck, so it could reach the food. By the fourth giraffe, it would be able to reach the leaves due to its extended neck length, which has changed over multiple generations.