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Yes, sub- or satellite colonies are common in many species (see e.g. Hölldobler & Wilson, 1990; Debout et al. 2007), and these are then labelled as polydomous species. Subcolonies can either contain e …

Mantis shrimp use their first maxillipeds for grooming (maxilliped=modified appendage), which is specialized for this purpose. Details and a picture of the organ can be found in the link. The second m …

Yes, it is a common behaviour and is called necromone signaling (Yao et al 2009, see references in paper for many examples), and is probably used to avoid predators, parasites and disease. The chemica …

Humans and other animals have lots of innate behaviors that are not learned from observation, i.e. behaviors that are hard-wired into our nervous system, and this is one of them. Suckling reflexes in …

The behaviour that you describe is common in most animal species, as part of the natural trade-off between access to food, minimizing risk, habituation and hunger. Animals usually choose to forage in …

Not really my field, but I can point to this review which discusses a couple of different ways in which ants organize their communities: Heinze. 2008. The demise of the standard ant (Hymenoptera: Form …

I don't know about the specific cues that American robins use for migration. This species is also both a short range (e.g. between states or to lower altitudes) and long range migrant (e.g. Florida & …

As expressed in the comments, the answer to this question depends on how you define 'hunting'. However, using common definitions in biology, hunting is almost used as a synonym to predation (see quote …

In eusocial insects, especially ants and bees, these groups are called "castes" (see e.g. Hölldobler & Wilson, 1990. This is the same term that is used for social stratifications in some human societi …