3. https://batrachospermum.livejournal.com/82160.html http://www.pnas.org/content/111/18/6672

4. https://www.nature.com/articles/s41598-019-44881-1

5. https://peerj.com/articles/5358/

6. https://www.nature.com/articles/s41586-020-2234-8

7. https://unews.utah.edu/croc-teeth/

8. https://www.nature.com/articles/s41586-020-2190-3#article-info 9.

https://www.sciencedirect.com/science/article/abs/pii/S003101822030225X

?via%3Dihub

10. https://vk.com/wall-57245617_9986?w=wall-57245617_9986

11. http://www.app.pan.pl/article/item/app20100045.html 12. https://royalsocietypublishing.org/doi/10.1098/rspb.2019.0409

13. https://peerj.com/articles/2908/

14. https://www.nature.com/articles/ncomms1642

15. https://www.nature.com/articles/s41598-018-37343-7#ref-CR18

16. https://www.nature.com/articles/s41467-018-03296-8

17.

https://news.utexas.edu/2018/01/15/dinosaur-may-have-dazzled-mates-with-rainbow-ruff/

18. https://news.ncsu.edu/2019/01/anchiornis-feather/

19. http://rsbl.royalsocietypublishing.org/content/14/5/20180135

20. https://www.nature.com/articles/s41559-019-1003-2

21. http://science.sciencemag.org/content/358/6367/1197