The bumblebee queen learns how to use the protective cap in less than 24 hours.

@Rainmaker1973

Does it help that the cap is transparent, or would it work if the entrance is hidden?

@relet @Rainmaker1973 my guess if the other spatial markers remain the same, maybe bolstered with scent markers too (all to confirm this is the right address and promote persistence) that could work.

to habituate the bee the cover could be made progressively more opaque.

might also help if the cover had a dark dot on it the size of the hole.

a testable question!

@falcennial
A dark blue cover would be interesting. Because bumble bees love blue. It shouldn't be white or another bright color.
@relet @Rainmaker1973
@falcennial
But I think the transparent cover is useful for the way out, time of day and weather conditions.
@relet @Rainmaker1973