Hohokum (JP)

On the level with the blue bamboo trees you will occasionally see fast moving animals crawling around the trees, however whenever you get close they will hide. In order to be able to "get a good look" at them, you will need to press which will cause your serpent to become invisible, move very slowly and also lower the game music so you can hear the creatures making chirping noises which will help guide you to their location. Head towards where you hear the creatures chirping and press when close so that you can examine the creature without it hiding. Doing this the first time will unlock Young Ognathologist (Ognadae Ognadae). Continue to search the level for these creatures until you have seen 4 different types (they have different shapes and colour patterns), and the trophy will unlock. Credit to Superbuu3 for the video.

https://www.youtube.com/watch?v=YqinP2ZIaoE