alert antennae bees brown buzzing community danger eyes furry hairy hive insects movement on guard protective soldier bees swarm swarming transparent wild bees wings angles background be-careful beware care caution color colored colors colour coloured colours combs dangerous height hexagonal high honey honey-combs layered layers mass nest on-guard pollinators risk risks risky safety soldier-bees striped tree tree-hollow advice announcement appropriate-behavior appropriate-behaviour avoid communicating communication concern honey-bees information informing sign signs warning warning-sign