থেরোপড ডায়নোসর, একধরনের দুইপেয়ে মাংসাশী ডায়নোসর। এদের বিশাল বড় বড় পা, তাই পায়ের ছাপও বড় বড়। ৫০ বছর পূর্বে অষ্ট্রেলিয়ায় কিছু পায়ের ছাপ আবিষ্কৃত হয়। এই পায়ের ছাপগুলো পরিমাপ করে গবেষকরা বুঝতে পারেন ডায়নোসরগুলোর শরীরের আকৃতি প্রায় ২০ ফুট এবং পা প্রায় ৭ ফুট মতো লম্বা। এই বৈশিষ্ট্যগুলো থেরোপড ডায়নোসরের সাথে মিলে যায় বলে তাদের ধারণা ছিলো এই পায়ের ছাপ গুলো মাংশ খেকো ডায়নোসরের।
প্রায় ৫০ বছর পর এসে যখন গবেষকরায় পুনরায় নিজেদের গবেষণা যাচাই বাছাই করলেন এবং পায়ের ছাপগুলো পরিমাপ করলেন তখন বোঝা গেলো আসলে পায়ের ছাপগুলো মোটেও থেরোপড ডায়নোসরের নয়, বরং আরও ছোট কোনো ডাইনো গোষ্ঠীর সদস্যের। এদের নাম Prosauropods, এরা আসলে তৃণভোজী ডাইনো গোষ্ঠী। তো এতদিন আমরা আসলে উধোর পিন্ডি বুধোর ঘাড়ে চাপায়ে আসছি।
Journal: Historical Biology
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