Oh no! Another alien probe

[Anomalocaris]

The fact that flowering plants co-evolved with birds and insects to require birds or insects to pollenate over the last 130 million years does not necessarily imply the first impetus towards evolving in this direction by plants necessarily came from insects or birds. The first impetus for the most primitive flower like organ could be to better pollenate by wind, for example.

But, flying insects and flying reptiles have existed during the entirety re period when flowering plants have existed.